Summarize the following court judgment. RISDICTION: Civil Appeals No. 194 202 of 1986. Appeals by Certificates from the Judgment & Order dated 9.12.85/17.12.85 of the Bombay High Court in Writ Petition Nos. 620 of 1984	 2653 of 1984	 394 of 1985	 456 of 1985	 457 of 1985	 183 of 1985	 660 of 1984	 126 of 1985 and 154 of 1985 V.M. Tarkunde	 M.C. Bhandare	 R.N. Sachthey	 S.B. Bhasme	 V.A. Bobde	 D. Dave	 R. Karanjawala	 Ms. Meenakshi Arora	 Mrs. Manik Karanjawala	 Jitender Sethy	 S.V. Tambwe kar	 M.N. Shroff	 A.S. Bhasme	 A.M. Khanwilkar	 P.G. Gok hale	 B.R. Aggarwala for the Appellants and J.H Bhatia	 Brambhate Petitioners in person. 908 K.K. Singhvi	 T.V.S.N. Chari	 Miss Manjula Gupta	 Ms. Kitty Kumarmangalam	 Ms. A. Subhashini and V.J. Francis for the Respondents. S.S. Patvardhan	 Intervener in person. The Judgment of the Court was delivered by SHARMA	 J. The perpetual rivalry for seniority in serv ice between the direct recruits and the promotees has once more engaged the attention of this Court for several days. The dispute which was brought to Court by S.B. Patwardhan in 1972 by a writ petition in the Bombay High Court and which was supposed to have been finally settled by the judgment of this Court reported in ( ; has been kept alive by some direct recruits till this date. The events relevant for the case are spread over a long period and the issues joined by the parties have been described in the earlier judgments as involving ticklish and complicated questions of unrivalled complexity with no earlier case comparable. The position as now stands is that the field of controversy on legal questions has been considerably narrowed down by the earlier decisions of this Court	 but the relevant facts and the issues to be settled have multiplied by further events and subsequent rules framed under the Proviso to Article 309 of the Constitution. For appreciating the controversy which has to be resolved	 a brief survey of several sets of rules is neces sary. The parties are Engineers in the employment of the State of Maharashtra excepting the petitioners in W.P. Nos. 3947 48 of 1983 who are in Gujarat service. Avoiding the details	 the position may be briefly stated by dividing the entire period into 4 sub periods and mentioning the scope of such of the provisions of the rules which have direct bear ing on the questions involved in the present cases. By a resolution of the year 1937 of the Government of Bombay	 two new Provincial Engineering Services described as the Bombay Engineering Service Class I consisting of posts of Chief Engineer	 Superintending Engineers	 Executive Engineers and Assistant Engineers Class I	 and the Bombay Engineering Service Class II	 having officers designated as Deputy Engineers	 were created. All the posts were permanent. In 1939	 Rules were made for regulating the methods of recruit ment to the said Services which directed the recruitment to be made either by nomination from amongst the students of the College of Engineering	 Pune or by promotion of officers holding inferior posts. The next Rules to which the parties in the present cases have made reference were those made by 909 the resolution dated 21.11. 194 1 for determination of the seniority of the direct recruits and the promoted officers	 containing only two rules out of which r. 1 admittedly is not relevant for the present purpose. Rule 2 said that in case of officers promoted to substantive vacancies	 the seniority would be determined with reference to the date of their promotion to the substantive vacancies. In 1960. detailed rules for recruitment to Class I and Class II Services were framed by a Government resolution dated 29.4. Learned counsel for the parties have referred to these Rules as the 1960 Rules and have made elaborate arguments with reference to some of the provisions. In place of nomi nation from the successful students of College of Engineer ing	 Pune as direct recruits	 these Rules prescribed for a competitive examination to be held by the Public Service Commission	 and introduced a quota system by fixing a ratio of appointments of direct recruits and promotees. The Rules also made reference to promotion	 as Executive Engineers on officiating basis	 and Temporary Deputy Engineers and offi ciating Deputy Engineers. By r. 8 the posts of Deputy Engi neers were re organised	 and by sub rule (iii).it was pro vided that the direct recruits in any year shall in a bunch be placed senior to promotees confirmed during that year. A review of these Rules was later undertaken by the Government and ultimately in partial supersession thereof a fresh set of rules	 described by the learned counsel in the present cases as the 1970 Rules	 were adopted by another Government resolution. In the meantime	 however	 a serious dispute in regard to the interpretation of one of the provisions of the 1960 Rules arose which was Settled by this Court in the case of P.Y. Joshi and others vs The State of Maharashtra and Others	 The judgment in this case has been the subject matter of considerable discussion during the hearing of present cases. By r. 5 of the 1970 Rules	 Class I and Class II Services were redefined and r. 12(a) declared that the cadre of Deputy Engineers would consist of all the direct recruits	 the confirmed Deputy Engineers and the other officers who were officiating as Deputy Engineers on 30.4. During the period 1960 70 adequate number of direct recruits were not available	 and a large number of promo tees	 therefore	 had to be appointed to officiate as Deputy Engineers on continuous basis. These appointments were made after following the procedure applicable to regular promo tions	 including consultation with the Public Service Com mission. By r. 12(b) the strength of the permanent Deputy Engineers was fixed at the total number of (a) the Deputy Engineers confirmed up to the date of commencement of the Rules	 (b) direct recruits to the posts of Deputy Engineers appointed till the 910 date of commencement of the Rules	 and (c) the Deputy Engi neers officiating on 30.4.1960; and it was provided that no fresh appointments in future would be made to this cadre and the vacancies arising would be transferred to the officers holding subordinate posts detailed in the sub rule in pro portions indicated. The learned counsel for the parties have referred to this cadre as the 'frozen cadre '. The question of seniority was dealt with in several rules	 out of which r. 33 is important. It said that the seniority list in each cadre in Class I and Class II shall be prepared in two parts one for the confirmed officers and other for those who were not confirmed; and that the confirmed officers would be treated as senior to the unconfirmed officers. Since the direct recruits were all appointed against the permanent posts	 they were reckoned to be senior to the officiating Deputy Engineers irrespective of the period for which they had been working continuously on the Deputy Engineer 's posts. These Rules were amended in 1972	 but there was no departure from the main scheme and the princi ple governing seniority. In pursuance of the 1970 Rules seniority lists were prepared leading to the filing of several cases which were ultimately disposed of by this Court in S.B. Patwardhan and others vs State of Maharashtra and others; 	 Patwardhan	 the appellant in that case	 was promoted tempo rarily as Deputy Engineer in 1959 and was confirmed after the coming in force of the 1970 Rules. The respondents No. 2 and 3 who were directly appointed as Deputy Engineers later were	 in view of the Rules	 shown as senior to Patwardhan. Patwardhan challenged the validity of r. 8(iii) of the 1960 Rules and 33 of the 1970 Rules as being violative of arti cles 14 and 16 of the Constitution. The judgment in the case is treated as a landmark in the service jurisprudence and has covered extensive grounds dealing with several important aspects relevant in the case. The learned counsel for the parties have in the course of their arguments read and re read the judgment and made elaborate comments on its inter pretation and effect	 which we will discuss later. In the result	 Patwardhan succeeded and r. 8(iii) of the 1960 Rules and r. 33 of the 1970 Rules were struck down. In view of the judgment in Patwardhan 's case	 it became necessary to prepare fresh seniority lists	 and since the re organised states of Bombay and Gujarat were formed on 1.11. 1958 under the provisions of the State Re organisation Act	 1956	 it was considered expedient to make rules for preparing seniority lists of Deputy Engineers in respect of the period 1.11.1956 to 30.4.1960	 that is	 the 911 date immediately after coming into force of the 1960 Rules. Rules were framed under Article 309 of the Constitution read with section 81(6) of the Bombay Re organisation Act	 1960	 and were called the Reorganised Bombay State Overseers and Deputy Engineers Seniority Lists Rules	 1978	 and have been referred to before us as the 1978 Rules. The seniority list of the Deputy Engineers as on 1.11.1956 which had been prepared earlier was declared by these Rules as valid and final. This was consistent with the decision in Patwardhan 's case. The further seniority lists were directed to be pre pared for the years 1957	 1958	 1959 and 1960 in accordance with the judgment in Patwardhan 's case wherein the seniority of the promotee Deputy Engineers was made dependant on the continuous officiation subject to certain other conditions. Since the preparation of the seniority lists and reversion of the direct recruits whose promotion was ille gal	 in view of the decision in Patwardhan 's case	 were being delayed	 one Bagayat Patil	 a promotee Deputy Engineer officiating as Executive Engineer	 filed a writ application being W.P. No. 3483 of 1980 in the High Court for implemen tation of the judgment	 inter alia	 on the ground that r. 6(iii) of the 1960 Rules relating to Class I being similar to the struck down r. 8(iii) was also illegal. Another writ application being W.P. No. 672 of 1981 was filed by the direct recruits challenging the validity of the 1978 Rules mainly on the ground that the Rules omitted to fix propor tionate quota for the direct recruits and the promotees. The two cases were disposed of by a common judgment upholding the validity of the 1978 Rules	 striking down r. 6(iii) of the 1960 Rules	 and issuing appropriate directions for reversion of the illegally promoted direct recruits as also for preparation of seniority lists in accordance with the judgment in Patwardhan 's case. Kulkarni	 one of the direct recruits	 in representative capacity	 challenged the judg ment before this Court in S.L.P. No. 8064 of 198 1 which was dismissed on 29.10.1981. On the same date S.L.P. No. 9161 of 1981	 filed by one Samtani was also rejected. A special leave petition by the State Government was also dismissed later. One of the direct recruits J.H. Bhatia	 who was admittedly represented by the petitioner in S.L.P. No. 8064 of 1981	 filed an application under Article 32 of the Con stitution before this Court on 1.2. 1982	 that is	 after the dismissal of S.L.P. No. 8064 of 1981	 which has been regis tered as W.P. No. 1327 of 1982 and is being disposed of by the present judgment. In 1981 further rules called Re organised Bombay State Assistant Engineers and Executive Engineers Seniority Lists Rules	 912 198 1	 described by the 'parties as the 198 1 Rules	 were flamed laying down the rule of determination of seniority of the Assistant Engineers and the Executive Engineers for the period 1.11.1956 to 30.4.1960. With respect to the prepara tion of the seniority list of the Executive Engineers	 r. 3(3)(a) read with Explanation to r. 3(4) fixed quota with retrospective effect between the direct recruits and the promotees	 and these rules were successfully challenged in the High Court in W.P. No. 362 of 1982. The 	judgment in the case striking down the above rules has not been directly questioned in this Court. The main Rules which are the subject matter of the present cases were framed in 1982 under Article 309 of the Constitution laying down the principle for fixing the sen iority for the period dated 1.5.1960 to 20.12.1970	 and are called the Maharashtra Service of Engineers (Regulation of Seniority and Preparation and Revision of Seniority Lists for Specified Period) Rules	 1982	 hereinafter referred to as the 1982 Rules. The Preamble states that they were framed in view of the decision of the Supreme Court in S.B. Pat wardhan vs State of Maharashtra and of Bombay High Court in W.P. No. 3483 of 1980. On their face	 they are consistent with the aforesaid judgments	 but by including two rules therein Rules 4 and 9	 deleted later fixing rigid quota with retrospective effect	 attempt was made to neutralise the decision and rob the promotees the 'benefit of their continuous officiation. Rule 9 (omitting the Explanation which is not relevant for the present purpose) read as follows: "9. Allocation of vacancies in cadre of Deputy Engineers for direct recruits and promotees. The number of vacancies in the cadre of Deputy Engineers in every year during the specified period and in the fractional year shall be deemed to be equal to the number of vacancies actually filled in that year or	 as the case may be	 fractional year	 and the first three fourths of such vacancies in each year or in the fractional year shall be deemed to be allocated for persons recruited directly as Deputy Engineers and the subsequent remaining vacancies in that year or in the fractional year shall be deemed to be allocated for filling by promotions from amongst Overseers who may be eligible for such promo tions in accordance with rules or orders made by Government from time to time during the specified period. " Rule 4; .dealing with the promotion of Assistant Engineers and Deputy 913 Engineers in vacancies in the cadre of Executive Engineers was in similar language. Section 2(h) defined "fortuitously appointed" in the following terms: "fortuitously appointed" means appointed in any vacancy which	 according to rule 4 or 9	 is not allocated for the class of officers to which the person appointed in that vacancy belongs; ' ' These rules were challenged in Writ Petitions No. 955 and 956 of 1983	 filed respectively by promotee Deputy Engineers Dafle and Kamtkar	 and by promoted Executive Engineers Lele and Panse (hereinafter mentioned as Dafle Lele case) before the Bombay High Court and were struck down as illegal. The High Court further ordered the State to carry out the direc tions given in Bagayat Patil 's case (W.P. No. 3483 of 1980). None 'of the Engineers came to this Court against this judgment	 except the State Government in S.L.P. Nos. 16614 15 of 1983 which also have been heard by us. However	 the prayer for stay was rejected. The result is that the senior ity has to be reckoned on the basis of continuous officia tion. By an amendment in 1984 the rr. 4 and 9 were formally deleted. For the purpose of fixing the seniority of Executive Engineers and Assistant Engineers for the period commencing on 21.12.1970	 separate rules were framed under Article 309 of the Constitution and are called the Executive Engineers and Assistant Engineers belonging to the Maharashtra Service of Engineers Class I and the Maharashtra Service of Engi neers Class II (Regulation of Seniority and Preparation and Revision of Seniority Lists) Rules	 1983 and will be re ferred to hereafter as the 1983 Rules. The validity of these Rules has been challenged in W.P. No. 1169 of 1986 filed under Article 32 in this Court. As stated earlier	 J.H. Bhatia filed Writ Petition No. 1327 of 1982 in person and obtained an ex parte rule. Another application under article 32 of the Constitution being W.P. No. 5 187 of 1983 was filed by Srikant Bharat Sohoni	 a direct recruit to Class II	 who	 besides challeng ing the 1978 Rules	 has also attacked the validity of the 1982 Rules	 although he did not file an appeal against the judgment of the High Court on this point. According to the learned counsel for the promotee respondents he was not concerned with the 1978 Rules at all but he mentioned the same in his application for the sole purpose of obtaining a rule on the ground of admission of Bhatia 's writ petition. 914 Encouraged by these two cases	 several other writ petitions were also filed and have been heard along with the Civil Appeals. Although the claim of the promotees to reckon the seniority according to the continuous officiation was ac cepted by this Court in Patwardhan 's case in 1977	 the State Government continued denying them the fruits of the litiga tion. The High Court on a complaint made by Bagayat Patil	 took note of the delay and issued directions for implementa tion of the judgment. Still nothing was done till 1984 and an application for starting proceedings in contempt was made before the High Court. In the meantime a fresh writ petition being W.P. No. 660 of 1984 was filed by the direct recruits before the Aurangabad Bench of the Bombay High Court and stay was obtained. Thereafter a number of similar applica tions were filed one after another	 either before the Nagpur Bench or the Aurangabad Bench of the Bombay High Court. When the promotees pointed out before this Court the game of the direct recruits	 a direction was issued for hearing of all the cases at Bombay. Accordingly aH the 15 writ applications were transferred and heard together at Bombay. The High Court rejected the case of the direct recruits and dismissed the writ petitions. The petitioners in 9 of them have chal lenged the judgment in Civil Appeals No. 194 202 of 1986. The main argument on behalf of the direct recruits has been addressed by Mr. V.M. Tarkunde	 who represents the appellants in the Civil Appeals and the writ petitioners in W.P. No. 1169 of 1986. The learned advocates in some of the other writ cases and two of the writ petitioners in person made supplementary arguments. It has strenuously been con tended that the 1978 Rules	 1982 Rules	 1983 Rules and the 1984 Rules are invalid and must be struck down. The judgment in Dafle Lele case has also been challenged. The cases were earlier heard for sometime by a Division Bench when the Bench referred the matter to be dealt with by a larger Bench for examining the correctness of the decision in Patward han 's case. When the cases were taken up for hearing before us	 it was faintly suggested that the principle laid down in Patwardhan 's case was unsound and fit to be over ruled	 but no attempt was made to substantiate the plea. We were taken through the judgment by the learned counsel for the parties more than once and we are in complete agreement with the ratio decidendi	 that the period of continuous officiation by a government servant	 after his appointment by following the rules applicable for substantive appointments	 has to be taken into account 915 for determining his seniority; and seniority cannot be determined on the sole test of confirmation	 for	 as was pointed out	 confirmation is one of the inglorious uncer tainties of government service depending neither on effi ciency of the incumbant nor on the availability of substan tive vacancies. The principle for deciding inter se seniori ty has to conform to the principles of equality spelt out by articles 14 and 16. If an appointment is made by way of stop gap arrangement	 without considering the claims of all the eligible available persons and without following the rules of appointment	 the experience on such appointment cannot be equated with the experience of a regular appoint ee	 because of the qualitative difference in the appoint ment. To equate the two would be to treat two unequals as equal which would violate the equality clause. But if the appointment is made after considering the claims of all eligible candidates and the appointee continues in the post uninterruptedly till the regularisation of his service in accordance with the rules made for regular substantive appointments	 there is no reason to exclude the officiating service for purpose of seniority. Same will be the position if the initial appointment itself is made in accordance with the rules applicable to substantive appointments as in the present case. To hold otherwise will be discriminatory and arbitrary. This principle has been followed in innumerable cases and has been further elaborated by this Court in several judgments including those in Baleshwar Dass vs State of U.P. and others	 [1981] 1 SCR 449	 and Delhi Water Supply and Sewage Disposal Committee and others vs R.K. Kashyap and others	 [ 1989] Supp. 1 SCC 194	 with which we are in agree ment. In Narender Chadha and others vs Union of India and others	 [ ; 	 the officers were promoted al though without following the procedure prescribed under the rules	 but they continuously worked for long periods of nearly 15 20 years on the posts without being reverted. The period of their continuous officiation was directed to be counted for seniority as it was held that any other view would be arbitrary and violative of Articles 14 and 16. There is considerable force in this view also. We	 there fore	 confirm the principle of counting towards seniority the period of continuous officiation following an appoint ment made in accordance with the rules prescribed for regu lar substantive appointments in the service. Mr. Tarkunde in the course of his argument made it clear that he was not questioning the ratio in Patwardhan 's case but was challenging the judgment therein as erroneous on the ground that the posts of temporary Deputy Engineers held by the promotees were not in the cadre of the Deputy Engineers	 which included only permanent posts	 and this position was not correctly appreciated there. The argu 916 ment is that since the permanent posts held by the direct recruits and the temporary posts which the promotees were allowed to officiate did not form a single cadre	 there could not arise any question of interse seniority amongst them. The finding to the contrary in Patwardhan 's case is said to have been inconnectly arrived at	 mainly due to the failure on the part of the State Government to place all the relevant materials before the Court. The stand of the appel lants is that having regard to all the facts and circum stances leading to the present litigation	 the direct re cruits cannot be held to be bound either by a rule of res judicata or otherwise and they are free to challenge the Patwardhan 's decision as incorrect. It is claimed that if the relevant position is correctly appreciated	 there is no escape but to hold that the 1960 Rules excepting r. 8(iii) and the 1970 Rules except r. 33	 were perfectly legal and the declaration about their invalidity was erroneous. The learned counsel contended that since the fresh Rules. which are now impugned	 were flamed as a result of the said enone ous judgment	 they have to be struck down. The observations in the judgment in P.Y. Joshi 's case were characterised as obiter dicta which cannot be held to be binding on this Court at a Subsequent stage	 and the question whether the direct recruits and promotees were in the same cadre or held posts in two separate and distinct cadres must be answered in accordance with the decision in State of Gujarat vs C.G. Desai and others	 [1974] 2 SCR 255 in favour of the appel lants. Developing his argument Mr. Tarkunde said that since the 1960 Rules and the 1970 Rules were perfectly valid	 they clothed the direct recruits with right of seniority over the promotees which could not be retrospectively taken away in view of their fundamental rights under articles 14 and 16 of the Constitution. He further urged that the quota rule applicable to the Service under the 1960 Rules was binding on all concerned and the High Court has in the Dafle Lele case erred in quashing rr. 4 and 9 of the 1982 Rules. The plea of the respondents that the quota rule was not strictl ly enforceable on account of the words "as far as practica ble" in r. 1(b) of the 1960 Rules or that it was relaxed Or given up later has been denied and it is said that the appointments of the promotees in excess of the quota	 there fore	 could not be treated as valid until the date when the posts became available in their share and consequently the earlier period cannot be considered for the question of theft seniority. The main thrust of Mr. Tarkunde 's argument is that the permanent Deputy Engineers and the officiating Deputy Engineers were in two cadres and as the officiating Deputy Engineers could not be treated to be included in the perma nent cadre having only perma 917 nent posts	 they were not entitled to compete with the direct recruits in the matter of seniority. It is true that initially the cadre consisted of only permanent posts. The promotees	 however	 claim that the additional posts were subsequently added to the cadre and no new cadre was formed. Great emphasis was laid by Mr. Tarkunde on the language of certain rules on the basis of which it was urged that the cadre of the permanent Engineers was higher in rank than that of the officiating Engineers	 who had to be fur ther promoted for becoming members of the said cadre. Rule 8(i) of the 1960 Rules	 which was relied on for this pur pose	 reads as follows: "8(i) The Sub Divisional posts in the Department are; at present	 manned by direct recruits to Bombay Service of Engineers	 Class II cadre	 Deputy Engineers confirmed from subordinate Service of Engineers	 the temporary Deputy Engineers recruited by the Bombay Public Service Commission	 officiating Deputy Engineers and similar other categories. These various categories are being compiled into two fists only	 viz.	 Bombay Service of Engineers	 Class II cadre of permanent Deputy Engineers and a list of Officiating Deputy Engineers. The future recruitments to Bombay Service of Engineers	 Class II cadre shall be made by nomination of candidates recruited direct by competitive examination	 held by the Commission	 and by promotions from the list of offi ciating Deputy Engineers. The number of such promotions shall be about one third the number of direct recruits appointed in that year. " argument is that if the officiating Deputy Engineers could be "promoted" to Bombay Service of Engineers	 Class II cadre	 how could they be treated as part of the said cadre earlier. It was pointed out that the second sentence of the above rule in express terms directs two lists to be pre pared	 one of the permanent Deputy Engineers	 and the other of officiating Deputy Engineers. Admittedly the appointment of all the direct recruits was made as against the permanent vacant posts and on their successfully completing the proba tionary period they were confirmed against those posts while the promotees were posted in the temporary posts as offici ating Deputy Engineers. Rule 80)	 according to the appel lants	 therefore	 makes a clear distinction between the two groups	 which could not be lumped together. Reliance was also placed on the language of rr. 5	 6	 12(a)	 30 and 33 of the 1970 918 Rules. We are not in a position to agree with the learned counsel that the rules indicate that the officiating posts were not included in the cadre of the Deputy Engineers. It is true that the use of word "promotions" in r. 8(i) of the 1960 Rules is not quite appropriate	 but that by itself cannot lead to the conclusion that the officiating Deputy Engineers formed a class inferior to that of the permanent Engineers. As was stated with reference to the expressions like 'substantive capacity '	 'service ' and 'cadre ' in Ba leshwar Dass vs State of U.P. and others	 [1981] 1 SCR 449 (at page 463 C E)	 we cannot attribute fixed connotation to the expression 'promotion ' without reference to the context. The expression	 there has been used in the sense of confir mation. The language used in several other rules is incon sistent with two cadre theory	 and by way of illustration r. 12(a) may be considered. Rules 5 and 24 of the 1970 Rules mention only 4 cadres in Class II namely	 those of Sub Divisional Officers	 Sub Divisional Engineers	 Assistant Engineers Class II and Deputy Engineers and there was no separate cadre of officiating Deputy Engineers. Rule 12(a) of the 1970 Rules expressly includes some of the officiating Deputy Engineers within the cadre of Deputy Engineers	 although it leaves behind the other officiating Deputy Engineers who started officiating later than 30.4.1960. Rule 13 speaks of officers "officiating in the earthwhile cadre of Deputy Engineers" and r. 27 of "officiating promotions" which are inconsistent with two cadre theory. In r. 33 of the 1970 Rules also two lists were directed to be prepared	 not cadrewise but in each cadre	 clear indicating that the lists were different from cadres. In r. 8(i) of the 1960 Rules also the different groups were not described as dif ferent cadres. They were referred to as "categories" and what the re organisation suggested was with reference to "lists" to be prepared. It will not	 therefore	 be right to equate the lists with cadres. It is true that the Rules have not in express language stated that the officiating posts also will be in the cadre but if all their relevant provi sions are considered	 they unmistakably lead to the said conclusion. Excepting the use of the word "promotions" in r. 8(i) of the 1960 Rules no other provision appears to help the appellants. This question was considered in Patwardhan 's case at considerable length	 and a categorical finding against the direct recruits was arrived at	 which has been followed for the last more than a decade	 in many cases arising between members of Maharashtra and Gujarat Engineering Services. The question is of vital importance affecting a very large number of officers in the departments concerned and many disputes have been settled by following the judgment in Patwardhan 's case. In such a situation it is not expedient to depart from the decision 919 lightly. It is highly desirable that a decision	 which concerns a large number of government servants in a particu lar Service and which has been given after careful consider ation of the rival contentions	 is respected rather than scrutinised for finding out any possible error. It is not in the interest of the Service to unsettle a settled position every now and then. Besides	 the learned counsel for the parties have placed the rival arguments on the issue in great detail with reference to every available material	 and in our opinion the finding was correctly arrived at. We also agree that the interpretation given in P.Y. Joshi and Others vs The State of Maharashtra and Others	 	 by a Bench of 5 Judges on r. 8 of the 1960 Rules	 which answers one of the main grounds of the direct recruits in support of two cadre theory	 must be respected. Mr. Tarkunde has at tempted to distinguish P.Y. Joshi 's case and has challenged the correctness of the observations at page 795 of the judgment in Patwardhan 's case. We do not agree with the learned counsel. The dispute in that case was in respect of promotion of promotee Deputy Engineers to posts of officiat ing Executive Engineers. Rule 7(ii) of the 1960 Rules pre scribed	 as a necessary condition for promotion	 the minimum service of seven years as Deputy Engineer. The respondent in P.Y. Joshi 's case were elgible	 provided their experience as officiating Deputy Engineers was allowed to be counted. The petitioners in that case were direct recruits to the posts of Deputy Engineers and they challenged the promotion of the respondents on the ground that they had not completed the seven years ' period after their confirmation as Deputy Engineers and the period for which they had been officiating as such was not available to them for the purpose. Their contention was "that under the rules in force the respond ents who were in substantive rank of Overseers were only officiating Deputy Engineers and that as they did not belong to the cadre of Deputy Engineers they were not entitled to promotion inasmuch as they had to put in after confirmation as Deputy Engineers 7 years of actual service before being eligible for promotion as officiating Executive Engineers". The arguments were addressed with reference to several rules including r. 8	 and this Court while rejecting the stand of the direct recruits observed thus: "In our view it is the list of such persons that is referred to in cl. (ii) of rule 8 and not that there should be a list of persons actually officiating as Engineers for further promotion to the same post which will have little meaning	 for there cannot be a promotion of a person in the same cadre of service who is already promoted whether as an officiating or temporary or permanent incumbant. If cl. (i) of r. 8 920 provides that Class 11 cadre shall be recruited by competi tive examination	 the promotees also are promoted from the list of persons considered fit to hold sub divisional charge	 i.e.	 post of Deputy Engineers. If in the case of direct recruits the appointment is without reference to confirmation	 it cannot be any different in the case of promotees. " This interpretation of r. 8 is binding as a precedent. It is Urged by Mr. Tarkunde that the ratio of the Division Bench judgment in State of Gujarat vs C.G. Desai and Others	 [1974] 2 SCR 255	 supports his argument and should be followed. We do not think so. The controversy	 there	 also related to the construction of r. 7(ii) of the 1960 Rules requiring the minimum service of 7 years for a Class II officer to be promoted as officiating Executive Engineer. The respondent No. 1 C.G. Desai who was not considered eligible for promo tion was earlier officiating as Deputy Engineer from May 1955 to December 1959. Thereafter he successfully competed at an examination for direct recruitment to Class II Service held by the Public Service Commission and was appointed as Permanent Deputy Engineer. For the purpose of his promotion to the higher cadre he relied on his officiating service before he was selected as a direct recruit	 which was denied by the Government. In a writ case his claim was accepted as legitimate by the High Court. This decision was challenged before this Court; and it was held by the judgment in the reported case that the respondent was not entitled to count his experience as officiating Deputy Engineer before his selection as a direct entrant in the Service. It was	 inter alia	 observed that if a person like the respondent leaves his position in the long queue of officiating Deputy Engi neers with a view to avoid the tortuous wait for promotion and takes a short cut	 "he gives up once for all the advan tages and disadvantages" of continuing as an officiating Deputy Engineer and accepts all the handicaps and benefits which attached to the group of direct recruits. "He cannot	 after .his direct recruitment claim the benefit of his pre selection service and thus have the best of both the worlds. " In this set up and for the purpose of construing r. 7 and considering the necessary qualification for promotion as an Executive Engineer	 it was observed that the direct recruits and the promotees in Class II constituted two groups or classes	 and it was pointed out that unless the pre selection service as officiating Deputy Engineer of direct recruits was excluded for reckoning the 7 years experience	 it would create two classes amongst the same group of direct recruits and result in discrimination against those direct recruits who had no such pre selection service to their credit. The 921 decision has to be understood in this background and it cannot be of any help to the present appellants. Even on an independent consideration of the provi sions of the Rules	 the relevant materials and the arguments addressed on behalf of the parties	 we are of the view that the temporary posts of Deputy Engineers against which promo tees officiated	 did not form a separate cadre and were additions to the main cadre. These temporary posts were created in pursuance of several resolutions of the State Government and an examination of their language is helpful in resolving the controversy. The resolution No. ENH 1062 C	 dated 8th November	 1962 (Ext. 'A ' at page 277 of Vol. V of the paper book) after referring to the sanction accorded by the Government for creation of the temporary posts stated	 "The posts of Executive Engineer and Deputy Engineer should be treated as temporary additions to their respective cadres. ' ' (emphasis added) Similarly the Resolution No. CDS 1170 F	 dated the 3rd of November 1970	 dealing with the temporary posts created in the departments of Irrigation and Power stated as follows: (pages 283 286	 at page 284 paragraph 3 of Vol. V of the paper book)	 "The temporary posts in each Department be treated as temporary additions to the respective cadres." (emphasis added) Mr. K.K. Singhvi	 the learned counsel for the promotees relied upon these resolutions and several other documents in support of the finding of this Court in P.Y. Joshi 's case and Patwardhan 's case comprising the single cadre theory and contended that these and other materials were available to the Court in Patwardhan 's case. Mr. Tarkunde	 on the other hand	 argued that some fresh materials have come to light since after the judgment in Patwardhan 's case	 which had not been made available by the State earlier. There is serious controversy as to the interpretation of these documents alleged to have been later discovered by the direct recruits and in our opinion they do not furnish any evidence of substantial nature to outweigh the materials produced by the State in Patwardhan 's case including the aforementioned resolutions. In the circumstances	 we do not consider it necessary to discuss this question any further and close the issue by holding that the 922 officiating Deputy Engineers were in the same cadre with the other Deputy Engineers in permanent posts. It has been next contended that even if the decision in Patwardhan 's case be held to be correct	 and it is as sumed that the posts of officiating Deputy Engineers are also included in the cadre of permanent Deputy Engineers	 rr. 4 and 9 of the 1982 Rules could not have been challenged as illegal and the decision of the Bombay High Court in Dafle Lele case striking down these rules is erroneous and fit to be over ruled. It was pointed out that the 1984 Rules flamed as a result of the said decision expressly stated that they were subject to the result in the Special Leave Petitions No. 16614 15 of 1983 filed by the State of Maha rashtra against the said decision	 and if the judgment in Dafle Lele case is set aside then the 1984 Rules will auto matically disappear. Great emphasis was laid by Mr. Tarkunde on the provision in the 1960 Rules fixing the ratio of the direct recruits and the promotees in the Deputy Engineers cadre; and it was urged that the question of seniority must be settled with reference to the time when posts became available to the promotees in accordance with the said quota rule. Merely for the reason that the promotees were allowed to officiate on the temporary posts in excess of their quota they cannot be permitted to steal a march over the genuine claimants to the posts namely	 the subsequently appointed direct recruits. Repelling the stand of the respondents it was argued that the quota rule never collapsed and remained operative and was confirmed by the decision in Patwardhan 's case. About the rule applying at the stage of appointment and not at the stage of confirmation	 as was held in the said judgment	 it was suggested that the observations cannot be legitimately interpreted as setting the officiating Deputy Engineers free of the principle of quota. It meant	 according to the learned counsel	 that if an officer was promoted within his quota	 the rule would be applicable with reference to the date of promotion and not the date of confirmation	 but where his promotion was in excess of the permissible quota his seniority would be reckoned with reference to the date when a vacancy became available for him	 and not on the basis of his continuous officiation. He will be entitled to count his officiating experience only on a vacancy being available to him in accordance with the quota rule. Reliance was placed on S.G. Jaisinghani vs Union of India and Others	 ; ; A.K. Subraman and Others vs Union of India and Others	 [1975] 2 SCR 979; V.B. Badami etc. vs State of Mysore and Others	 15 and Paramjit Singh Sandhu and Others vs Ram Rakha and Oth ers; 	 Alternatively it was contended that assuming that the quota rule had collapsed as a 923 result of non availability of direct recruits	 the State Government was under a duty to change the ratio by allotting a larger share to the promotees	 which was belatedly done in 1970. So long the rule was not amended the same had to be respected. On the strength of observations in Bishan Sarup Gupta vs Union of India and others	 [1975] Supp. SCR 491	 it was urged that collapse of quota rule does not make seniori ty dependant on continuous officiation. It calls upon the Government to frame better rules to meet the requirements of the situation. The quota rule was for the first time introduced by the 1960 Rules. As already mentioned	 these Rules were introduced through executive instructions issued by the State Government. The statutory rules which were holding the field earlier did not fix any ratio between the direct recruits and the promotees. Rule 1 of the 1960 Rules which is relevant in this context is quoted below: "1. Appointment to the Bombay Service of Engineers	 Class I and Class II	 shall be made either (a) by nomination after a competitive examination held by the Bombay Public Service Commission hereafter called the Commission in accordance with the rules appended	 or (b) by promotion from amongst the members of the lower cadres concerned. Provided that the ratio of the appointment by nomination and by promotion shall	 as far as practicable	 be 75:25. " It will be noticed that the ratio of 3:1 was fixed for the purpose of "appointment"	 and not for the strength in the Service	 as was suggested on behalf of the appellants. The other important feature was that the Proviso fixing the ratio	 far from being imperative	 permitted the State Gov ernment to exercise its discretion according to the demand of the exigencies	 by using the expression "as far as prac ticable". The case of the appellants is that the said ex pression was inserted in the Proviso with the object of avoiding fractions in arithmetical calculations of number of posts available to the two groups	 and for no other purpose. We do not see any reason to so restrict the scope and mean ing of the expression "as far as practicable". A similar expression in identical terms used in certain other rules came up for consideration in N.K. Chauhan and Others vs State of Gujarat and 924 Others; 	 	 and it was held that if it became nonfeasible and impracticable for the State to fill up the requisite quota by direct recruits after making a serious effort to do so	 it was free to fill the posts by promotion of suitable hands	 if the filling up of the vacancies was administratively necessary and could not wait. Similar is the position here	 and the r. 1 of the 1960 Rules must be held to be realistic and flexible	 true to life rather than abstractly absolute. It was strenuously contended by Mr. Tarkunde and was reiterated by the other learned counsel that the State Government erred in promoting the officers from the lower cadre far in excess of their legitimate share in the Service	 and the promotees cannot be allowed to take advantage of this wrong perpetuated from year to year. Reply of the respondents is that direct recruits suitable for appointment were not available and if appointments had been defined on that account the fast developing departments	 entrusted with quick improvement in several fields would have been rendered crippled	 leading to grave injury to the industrial and other growths in the State. The public inter est demanded that the improvement work did not suffer on account of non availability of suitable candidates for nomination	 when competent Engineers fit to shoulder the responsibility were available in abundant number in the departments themselves. It will bear repetition that the promotees were not appointed in a casual manner; the Rules applicable for substantive appointments were meticulously followed and eligible officers were subjected to all the tests including scrutiny by the Public Service Commission before they were promoted. The reason for not adhering to the quota rule was admittedly the non availability of the direct recruits and was specifically mentioned in the Gov ernment 's resolution of 1970 as a reason for replacing the old rules by new ones. Mr. Singhvi	 the learned counsel for the respondents	 argued that having regard to the relevant facts and circumstances	 there is no escape from the conclu sion that the quota rule spelt out by the executive instruc tions in the 1960 Rules had in fact collapsed	 and that this fact can be recognised even without issuing a formal amend ing instruction. It is permissible to draw an inference to that effect by the steps taken by the State Government	 repeatedly and for a considerable period	 in disregard of such a rule	 and specially so where the quota is not fixed in imperative terms. Reliance was placed on the observations at page 209 of the judgment of this Court in P.C. Sethi and Others vs Union of India and Others	 as reported in ; The quota of direct recruits in that case had not been enforced "perhaps for good reasons as noted above	 the policy of the Government being different". In this back ground it was stated that administrative instructions	 if not carried into effect for obvious and good reasons	 cannot 925 confer a right upon entrants on later recruitment to enforce the same. The learned counsel appears to be right. It has	 however	 been rightly suggested on behalf of the appellants that when recruitment is from more than one source	 there is no inherent invalidity in introducing quota system	 but as was observed in Subraman 's case (supra)	 the unreasonable implementation of such a rule may attract the frown of the equality clause. Further	 if a rule fixing the ratio for recruitment from different sources is framed	 it is meant to be respected and not violated at the whims of the authority. It ought to be strictly followed and not arbitrarily ignored. This	 of course	 may not prevent the Government from making slight deviations to meet the exigen cies. If it is discovered that the rule 'has been rendered impracticable	 it should be promptly substituted by an appropraite rule according to the situation. The question	 however	 is as to what is the conclusion if the quota rule is not followed at all continuously for a number of years	 after it becomes impossible to adhere to the same. Admitted ly in the present cases direct recruits were not available in adequate number for appointment	 and appropriate candi dates in the subordinate rank capable of efficiently dis charging the duties of Deputy Engineers were waiting in their queue. The development work of the State peremptorily required experienced and efficient hands. In the situation the State Government took a decision to fill up the vacan cies by promotion in excess of the quota	 but only after subjecting the officers to the test prescribed by the rules. All the eligible candidates were considered and the opinion of the Public Service Commission was obtained. The appoint ments were not limited to a particular period and as a matter of fact continued till 1970 when the fresh rules were introduced. The stand of the appellants is that whenever ap pointments are made in violation of a quota rule the ap pointees will have to go down below the new entrants	 join ing the Service in accordance with their quota. The cases relied upon by Mr. Tarkunde do discuss the general princi ples about the enforceability of quota rule and the effect of its violation	 but do not profess to lay down the univer sal rule applicable. to every case irrespective of the other relevant circumstances arising therein. On the other hand	 the decisions cited by Mr. Singhvi deal with circumstances similar to those in the present cases and are illustrative of situations where the general rule has to yield to just exceptions. Indeed	 Mr. Tarkunde himself attempted to dis tinguish them on the ground that the government had relaxed the quota rule in those cases. The fallacy in the argument	 however	 is that the present cases are also of the same category. 926 23. Mr. Tarkunde is fight that the rules fixing the quota of the appointees from two sources are meant to be followed. But if it becomes impractical to act upon it	 it is no use insisting that the authorities must continue to give effect to it. There is no sense in asking the perform ance of something which has become impossible. Of course	 the Government	 before departing from the rule	 must make every effort to respect it	 and only when it ceases to be feasible to enforce it	 that it has to be ignored. Mr. Tarkunde is fight when he says that in such a situation the rule should be appropriately amended	 so that the scope for unnecessary controversy is eliminated. But	 merely for the reason that this step is not taken promptly	 the quota rule	 the performance of which has been rendered impossible	 cannot be treated to continue as operative and binding. The unavoidable situation brings about its natural demise	 and there is no meaning in pretending that it is still vibrant with life. In such a situation if appointments from one source are made in excess of the quota	 but in a regular manner and after following the prescribed procedure	 there is no reason to push down the appointees below the recruits from the other source who are inducted in the Service subse quently. The later appointees may have been young students still prosecuting their studies when the appointments from the other source take place and it is claimed on behalf of the respondents that this is the position with respect to many of the direct recruits in the present case and	 it will be highly inequitable and arbitrary to treat them as senior. Further	 in cases where the rules themselves permit the Government to relax the provisions fixing the ratio	 the position for the appointees is still better; and a mere deviation therefrom would raise a presumption in favour of the exercise of the power of relaxation. There would be still a third consideration relevant in this context: name ly	 what is the conclusion to be drawn from deliberate continuous refusal to follow an executive instruction fixing the quota. The inference would be that the executive in struction has ceased to remain operative. In all these cases	 the matter would however be subject to the scrutiny of the Court on the ground of mala fide exercise of power. All the three circumstances mentioned above which are capa ble of neutralising the rigours of the quota rule are present h: the cases before us	 and the principle of senior ity being dependant on continuous officiation cannot be held to have been defeated by reason of the ratio fixed by the 1960 Rules. The decisions relied upon by Mr. Singhvi deal with similar situation and are consistent with our opinion. 927 25. The decisions relied upon by Mr. Tarkunde support his argument in general terms but are distinguishable on account of the special features in the present cases. Mr. Singhvi contended that many important observations in those cases also support the respondents on several relevant aspects	 as for example	 the statement at pages 990H991B in the judgment in A.K. Subrman 's case as reported in to the following effect: "It is submitted by the respondents that one third quota cannot be filled unless the two third quota was ex hausted. This	 in our view	 will introduce sterility in the quota rule so far as the promotees are concerned. Their hopes and aspirations cannot be related to the availability or non availability of the direct recruits to fill the two third quota. Each quota will have to be worked independently on its own force. The word "rest" in the quota rule cannot be pressed into service to defeat the object of the rule coming in aid of advancement of prospects of promotees in the hierarchy of the Service. Relying on the observations at page 505H of the judgment in Gupta 's case reported in [1975] Supp. SCR 491	 Mr. Tarkunde strenuously urged that even on the assumption that the quota rule in the present cases had	 in fact	 broken down	 it was imperative on the part of the Government to have framed fresh workable rules before promoting the respondents. The learned counsel for the promotees distin guished the decision	 and to our mind correctly	 on the ground that there the manner and terms of the appointments made in breach of the quota rule	 were widely different from those in the present cases. The special facts as they appear from the other judgment in the Gupta 's case reported in ; 	 were stated at page 113E F thus: "It is necessary to remember	 however	 in this connection that all these officers had been told when promoted that their appointments were on an officiating or ad hoc basis and the question of their seniority had not been determined. It was thereby implied that orders about seniority could only be passed after the department was in a position to take a decision with regard to the inter se seniority be tween the promotees and the direct recruits. That being the situation of all these officers	 they could hardly contend that the dates of appointments will not be altered for the purposes of determining seniority. " 928 The decision was later considered in P.S. Mahal and others vs Union of India and Others	 ; 	 and the analysis given at pages 877E 880 clearly indicates that the decision has to be understood in the background of the facts therein and cannot have a universal application irrespective of the situation. This judgment as well as the decision in Badami 's case (supra) were rightly distinguished in Patward han 's case at page 797. It has also been alternatively argued on behalf of the appellants that by the statement in the judgment in Patwardhan 's case that the quota rule applied at the stage of appointment and not at the stage of confirmation	 this Court did not mean to say that those who were promoted in an officiating capacity were not subject to the quota rule. The contention is that what was meant to be conveyed by the aforesaid observations was that if an officer had been promoted within his quota then it would be the date of his promotion and not the date of confirmation which would be relevant for the officer 's seniority	 but where the officer is promoted in excess of his quota his seniority would arise when a vacancy in his quota becomes available. We are afraid	 it is not possible to read the judgment as suggest ed. The finding at pages 795F796A	 in the following words does not leave any room for controversy; "In this view of the matter	 the prescription contained in the closing sentence of r. 8(i) that "the number of such promotions shall be about 1/3rd the number of direct re cruits appointed in that year" would apply to initial ap pointments and cannot govern the confirmation of those who have already been appointed to Class II cadre. In other words	 direct recruits and promotees have to be appointed in 	the proportion of 75:25 to Class II cadre	 the former as Deputy Engineers and the latter as officiating Deputy Engi neers	 but once that is done	 the quota rule would cease to apply with the result that confirmations in the post of Deputy Engineers are not required to be made in the propor tion in which the initial appointments had to be made. Thus rule 8(i) only requires that for every three direct recruits appointed as Deputy Engineers only one promotee can be appointed as officiating Deputy Engineer. The rule cannot be construed to mean that for every three confirmations of Deputy Engineers	 not more than one promotee can be con firmed as Deputy Engineer. " Relying upon the observations in the Patwardhan 's case that the quota 929 system was an important feature of the 1960 Rules	 it was contended by Mr. Tarkunde that it is not permissible to hold that the rule in this regard had been relaxed by the Govern ment or that it had at any point of time broken down. We do not find it permissible to construe the statement in the judgment	 referred to	 to lead to such a conclusion. This argument	 as has been addressed before us on the basis of the quota rule as an additional contention was not pressed in Patwardhan 's case and so there was no occasion for this Court to deal with the same. The observations referred to by Mr. Tarkunde were made in a different context altogether. If it be assumed that this argument was constructively involved in the Patwardhan 's case	 then it follows that the same must be deemed to have been overruled. The case clearly	 in unambiguous terms	 rejected the claim of the direct recruits for seniority over the promotees. The appellants by trying to interpret a part of the observation made in the judgment in a different context	 in an artificial and uncalled for manner	 are suggesting that the judgment is self contradic tory	 but we do not find any justification for such an inference. Still another point confined against a certain category of the officiating Deputy Engineers who were not included in the frozen cadre under the 1970 Rules was at tempted. The contention is that the expressions "all the promoted Deputy Engineers" and "all directly recruited Deputy Engineers" used in Patwardhan 's case should be given restricted meaning	 so as not to include those officiating Deputy Engineers who were not included in the frozen cadre within the group of "promoted Deputy Engineers"; and the Assistant Engineers Class II within the group of "directly appointed Deputy Engineers". It is said that although in the judgment it was stated that the different groups in the Service were there in representative capacity	 these groups were actually not represented. Even assuming that to be so	 it is not possible to hold that the principle of seniority being dependent on continuous officiation will not apply to these groups of the officers. The reasons for rejecting the case of the appellants are equally applicable to all the promoted Deputy Engineers including those who were earlier Sub Divisional Engineers and Sub Divisional Officers	 as well as all the directly recruited Deputy Engineers. The suggested division of the two groups into further sub cate gories will result in illegal discrimination. Mr. Tarkunde also urged that as a result of the judgment in Patwardhan 's case it was not necessary to frame the entire rules afresh	 inasmuch as only r. 8(iii) of the 1960 Rules and r. 33 of the 1970 Rules 930 had been struck down. The grievance against the 1982 Rules is that it has disturbed the order of seniority of the parties with retrospective effect	 which is illegal. The argument has to be rejected as it fails to take note of the finding that the direct recruits who joined the service later than the promotees were at no point of time senior. The 1982 Rules merely recognised this position and gave effect to it. They have (excepting the arbitrary and discriminatory provisions of rr. 4 and 9) undone the inequality	 inequity and illegality which were the products of the offending provisions of the earlier Rules	 and there is no reason whatsoever to doubt their validity. The judgment of the Bombay High Court striking down rr. 4 and 9 of the 1982 Rules has been seriously criticised on behalf of the appellants. The grounds of challenge	 however	 are the same which have been considered earlier. Excepting the State of Maharashtra challenging this judgment in S.L.P. Nos. 16614 15 of 1983 no other party has directly impugned it. So far Mr. A.S. Bhasme	 who appeared on behalf of the State of Maharashtra	 is concerned	 he faintly de fended all the steps of the State taken from time to time	 and made certain statements which were criticised on behalf of the appellants in the Civil Appeals as amounting to Unjustified concessions in favour of the promotees. Since we have not gone by the stand taken on behalf of the State of Maharashtra before us during the argument	 and our decision is based on a consideration of the merits of the different questions argued by the parties and not on any concession	 we do not consider it necessary to deal with Mr. Bhasme 's argument at any length. We hold that the rr. 4 and 9 of the 1982 Rules were tightly struck down and consequently the 1984 Rules were correctly framed and have to be upheld as legal and valid. Mr. Tarkunde took great pains in analysing the practical effect of the judgment in Patwardhan 's case with which we agree and contended that the direct recruits shall suffer seriously if the present Civil Appeals	 Writ Peti tions and the Special Leave Petitions are not allowed. Mr. Singhvi challenged the figures worked out on behalf of the appellants. We do not consider it necessary to go into this controversy as it cannot be denied that as a result of Patwardhan 's case and on dismissal of present cases a large number of promotees have to be treated as senior to the direct recruits	 and in that sense the direct recruits do suffer. This	 however	 cannot be avoided. If their case on merits is not correct	 it cannot be assumed that they were at any point of time clothed with any right	 which they are being deprived of. If the decision in Patwardhan 's case had been given effect to promptly	 many 931 of them would have been reverted to inferior posts but by their persistance	 both before the higher authorities of the State and the Courts	 they have sufficiently delayed the matter so as to avoid the reversion of any one of them. Mr. Bhandare	 appearing in W.P. No. 5187 of 1983 and W.P. No. 8594 of 1983	 generally adopted the argument ad dressed by Mr. Tarkunde and added by saying that the offi cers should have been	 on a proper classification	 divided into 3 classes. namely_	 (i) Assistant Engineers Class I	 (ii) the Deputy Engineers directly recruited in Class II	 and (iii) the officiating Deputy Engineers promoted from Class III	 and quota should have been fixed separately for 3 classes right up to the top stage where appointments are to be made by promotion. He prayed for a direction to the authorities to frame fresh rules including appropriate provisions on the lines suggested by him. In view of our finding that the 1982 Rules as amended by the 1984 Rules do not suffer from any infirmity	 there is no occasion for issuing any further direction. So far the question of fixing the ratio of the appointments from different sources is concerned	 it is a matter of policy for the Government and it is not for us to offer our advice. The petitioner in W.P. No. 5187 of 1983	 S.B. Soho ni	 was directly appointed as a Deputy Engineer in March 1961 and was confirmed in 1963. It was	 therefore	 rightly pointed out by Mr. Sighvi that he was not concerned with the 1978 Rules at all. The writ petition	 in absence of grounds relating to the 1978 Rules	 confirms this impression. He has of course challenged the 1982 Rules	 as they stood before the amendment in 1984	 but did not	 after 1984 amendment	 make any prayer for modification of his writ petition. He also did not consider it necessary to file an appeal against the High Court judgment. No additional ground has been raised on his behalf to be dealt with separately. So far the petitioner in Writ Petition No. 8594 of 1983	 J.T. Jangle is concerned	 he was an earlier appointee and was included in the seniority list of November 1956. This list was confirmed by the decision in Patwardhan 's case (vide page 800G of the judgment as reported in ; It has been stated in his petition that although some junior officers were promoted as Executive Engineers earli er	 his promotion was delayed and took place in October 1973. He has not given the details in this regard or the names of the junior officers who superseded him. He was not considered eligible for promotion as Executive Engineer earlier as he had not completed 7 years ' service as required by the 1960 Rules. He has not impleaded those who 932 have superseded him and has not made any specific prayer in this regard. Besides	 in view of the decision in P.Y. Joshi 's case (supra) he could not have claimed promotion before completing 7 years of service. We do not find any merit in either of the two writ petitions W.P. No. 5187 of 1983 and W.P. No. 8594 of 1983 pressed by Mr. Bhandare. Writ Petition No. 1327 of 1982 was argued by J.H. Bhatia	 the petitioner	 in person. He was directly recruited as Deputy Engineer Class II in July 1959 and has challenged the constitutional validity of the 1978 Rules. Mr. Singhvi	 the learned counsel for the respondents	 took a preliminary objection to the maintainability of the writ application on the ground that his claim stands barred by principles of res judicata. Admittedly	 he was represented in W.P. No. 672 of 1981	 filed before the Bombay High Court which was dismissed on 7.9. 1981	 upholding 1978 Rules. An application under article 136 of the Constitution being numbered as S.L.P. No. 8064 of 1981 was filed from this judgment in representative capacity and was dismissed by this Court on 29.12. These facts were not denied by the petitioner before us	 and it was therefore contended on behalf of the respondents that so far the validity of the 1978 Rules is concerned	 it must be held to be binding on the petitioner in respect of iden tical relief now pressed by him in the present writ case. The objection appears to be well founded. It is well estab lished that the principles of res judicate are applicable to writ petitions. The relief prayed for on behalf of the petitioner in the present case is the same as he would have	 in the event of his success	 obtained in the earlier writ petition before the High Court. The petitioner in reply contended that since the special 'leave petition before this Court was dismissed in limine without giving any reason	 the order cannot be relied upon for a plea of res judicata. The answer is that it is not the order of this Court dismissing the special leave petition which is being relied upon; the plea of res judicata has been pressed on the basis of the High Court 's judgment which became final after the dismissal of the special leave petition. In similar situation a Con stitution Bench of this Court in Daryao and Others vs The State of U.P. and Others	 ; 	 held that where the High Court dismisses a writ petition under article 226 of the Constitution after hearing the matter on the merits	 a subsequent petition in the Supreme Court under Article 32 on the same facts and for the same reliefs filed by the same parties will be barred by the general principle of res judicata. The binding character of judgments of courts of competent jurisdiction is in essence a part of the rule of law on which the administration of justice	 so much empha sised by the Constitution	 is 933 rounded and a judgment of the High Court under article 226 passed after a hearing on the merits must bind the parties till set aside in appeal as provided by the Constitution and cannot be permitted to be circumvented by a petition under Article 32. An attempted change in the form of the petition or the grounds cannot be allowed to defeat the plea as was observed at page 595 of the reported judgment	 thus: "We are satisfied that a change in the form of attack against the impugned statute would make no difference to the true legal position that the writ petition in the High Court and the present writ petition are directed against the same statute and the grounds raised by the petitioner in that behalf are substantially the same. " The decision in Forward Construction Co. and others vs Prab hat Mandal (Regd.)	 Andheri and Others	 ; 	 further clarified the position by holding that an adjudica tion is conclusive and final not only as to the actual matter determined but as to every other matter which the parties might and ought to have litigated and have had decided as incidental to or essentially connected with subject matter of the litigation and every matter coming into the legitimate purview of the original action both in respect of the matters of claim and defence. Thus	 the principle of constructive res judicata underlying Explana tion IV of section 11 of the Code of Civil Procedure was applied to writ case. We	 accordingly hold that the writ case is fit to be dismissed on the ground of res judicata. The petitioner	 however	 was permitted during the hearing	 to place his case on merits and he did so at some length	 and Mr. Singhvi replied thereto. We have considered the arguments carefully and do not find any substance in the claim of the petitioner and we proceed to indicate our reasons briefly. The petitioner J.H. Bhatia was appointed Deputy Engineer as a direct recruit in 1959 and was promoted as Executive Engineer in 1969. According to his case	 he was governed by the 1941 Rules and was	 therefore	 entitled to a higher position in the list of seniority. It has been con tended by him that he was entitled to the benefit of either the 1941 Rules or the provision relating to quota in 1960 Rules and in either event he. would have been eligible for promotion to the rank of Executive Engineer three years earlier	 that is	 in 1966. On account of this delay in his promotion he seriously suffered by the further delay in his next promotion as Superintending Engineer by a considerable 934 period. With reference to the criticism against the 1941 Rules in the judgment of Patwardhan 's case the petitioner urged that the same should be treated as passing remarks. fit to be ignored. Alternatively he has adopted the argu ments addressed on behalf of the appellants challenging the correctness of the decision in Patwardhan 's cast 38. As has been stated earlier	 the seniority list of the Deputy Engineers for the period up to 1.11.1956 was confirmed in the Patwardhan 's case. The question of deter mining the seniority for the subsequent period arose in pursuance of the further decision in this judgment. The 1960 Rules were enforced with effect from 30.4.1960 which intro duced	 for the first time	 several new provisions including the quota rule. The period from 1.11.1956 to 30.4.1960 was	 therefore	 separately dealt with by framing the 1978 Rules under Article 309 of the Constitution. In accordance with the decision in Patwardhan 's case the seniority list of the Deputy Engineers as on 1.11.1956 was declared by these Rules as valid	 final and binding	 and thereafter the further seniority fists were directed to be prepared for the years 1957	 1958	 1959 and 1960 on the basis of continuous offici ation in accordance with the judgment. The petitioner con tends that the judgment in Patwardhan 's case cannot be interpreted to have struck down the 1941 Rules and the claim of the direct recruits appointed prior to the coming in force of the 1960 Rules must be upheld in view of the provi sions of r. 2 of the 1941 Rules. The 1941 Rules contained only two rules which are quoted below: "1. In the case of direct recruits appointed substantively on probation	 the seniority should be determined with refer ence to the date of their appointment on probation. In the case of officers promoted to substantive vacan cies	 the seniority should be determined with reference to the date of their promotion to the substantive vacancies provided there has been no break in service prior to theft confirmation in those vacancies. Mr. Singhvi replied by saying that r. 2	 aforemen tioned	 when properly understood	 does not help the peti tioner at all	 inasmuch as the rule refers to substantive vacancies and not permanent appointments.	 and substantive vacancies can arise even in temporary posts. Reliance was placed on the observations in Baleshwar Dass ' V. [1981] 1 SCR 449. However	 we do not consider it necessary to deal with this argument	 as in our view the petitioner cannot succeed even 935 otherwise. The substance of the petitioner 's argument is again the same as has been contended on behalf of the appel lants in the Civil Appeals	 namely	 that the principle of seniority being dependent on continuous officiation as laid down in Patwardhan 's case should not be accepted. The con tention is that the seniority ought to be reckoned with reference to the dates of permanent appointment in the cadre. This argument precisely was rejected in Patwardhan 's case and we are in complete agreement with the same. We also do not accept the argument of the petitioner that the judg ment did not deal with the 194 1 Rules. The said Rules were pointedly considered at pages 790G79 IE in the published report and it was	 inter alia	 held	 "The 194 1 Rules contained the real germ of discrimination because the promotees had to depend upon the unguided pleas ure of the Government for orders of confirmation. In the pre Constitution era	 such hostile treatement had to be suffered silently as a necessary incident of government service. ' ' It has to be remembered that the 1941 Rules	 made under an executive instruction	 do not stand on a stronger footing than the provisions of the subsequent similar Rules which have been struck down on the ground of illegal discrimina tion; and as in the case of the 1982 and the 1984 Rules	 the 1978 Rules also were framed under Article 309 of the Consti tution. No valid objection can be taken against the 1978 Rules made for undoing the wrong resulting from arbitrari ness and offensive discrimination which had visited the promotees. Mr. Bhatia has	 by his written argument	 belatedly alleged mala fides on the part of the State Government on the ground that it failed to prepare and publish select fists for a number of years and it attempted to mislead this Court by not stating the correct position in regard to the cadre of the Deputy Engineers and the 1941 Rules. We do not find any justification for the petitioner or any other direct recruit to urge lack of bona fides on the part of the State. We do not find any merit in any of the submissions addressed by the petitioner. The retired Superintending Engineer	 Shripad Shankar Patwardhan	 intervenor in Writ Petitions No. 1327 of 1982	 5187 of 1983 and 8594 of 1983	 also made a few submissions in person and filed a note of his argument in the shape of an affidavit. He has not raised any additional ground	 and it is not necessary to discuss his case any further. 936 42. The two petitioners in Writ Petitions No. 3947 48 of 1983 are Executive Engineers in the Irrigation Department of the Government of Gujarat. Although the case was initially filed through advocates	 at the hearing on a request by them the petitioner No. 1 was allowed to argue the case in person on their behalf. Besides impleading the State of Gujarat	 the Government of Maharashtra and the Union of India as respondents No. 1	 2 and 3 respectively	 H.N. Shah	 another officer of the same Department	 was	 made a party as re spondent No. 4 in the writ petition. The case of the peti tioners is that the respondent No. 4 was junior to them and was erroneously treated as senior in the seniority lists for the period 1.11.1956 to 30.4.1960 prepared in accordance with the 1978 Rules. The writ petition states that the petitioners were in Subordinate Engineering service of the former State of Bombay when they appeared at the competitive examination held for direct recruitment and were appointed Deputy Engi neers. At the same examination	 H.N. Shah	 respondent No. 4	 who was an officiating Deputy Engineer	 also appeared and was appointed a Deputy Engineer as a direct recruit and his name appeared in the list below the petitioners. After the bifurcation of the two States of Maharashtra and Gujarat in 1960	 the petitioners as well as the respondent No. 4 were allocated to the State of Gujarat. In 1969 the petitioner No. 1 and the respondent No. 4 were promoted as Executive Engineers and the name of the respondent No. 4 was again shown lower in the list. It is stated in paragraph 13 of the writ petition that the petitioner No. 2 was temporarily dropped in this promotion order on administrative grounds. It is contended on behalf of the petitioners that these lists correctly placed the respondent No. 4 below the peti tioners but the subsequent lists prepared in pursuance of the 1978 Rules wrongly show him as senior. A counter affidavit on behalf of the State of Maharash tra was filed inter alia denying several allegations in the writ petitions explaining certain circumstances by giving all the relevant materials	 and explaining the situation. S.B. Patwardhan	 the petitioner in the reported case	 also intervened and refuted the claim of the petitioners. The respondent No. 4 has retired in the meantime and has not appeared in this case. The petitioner No. 1	 after making a very brief argu ment	 filed written submissions	 but since in our view the Patwardhan 's case was correctly decided	 the State was under a duty to prepare fresh 937 seniority lists for the period 1.11	 1956 to 30.4.1960	 and this was done after framing the 1978 Rules. We do not find any merit in the challenge to the 1978 Rules	 as indicated earlier	 and in that view these writ petitions are fit to be rejected	 specially as the respondent No. 4 has already retired. The only other case which was separately argued on behalf of the petitioners was Writ Petition No. 12570 72 of 1983. Mr. 'Vinod Arvind Bobde	 the learned counsel for the petitioners	 in a brief submission adopted the argument of Mr. Tarkunde and reiterated that the finding in the Patward han 's case about the temporary posts being included in the main cadre was erroneous. The point has already been dealt with. 44. To sum up	 we hold that: (A) Once an incumbent is appointed to a post according to rule	 his seniority has to be counted from the date of his appointment and not according to the date of his confirma tion. The corollary of the above rule is that where the initial appointment is only ad hoc and not according to rules and made as a stop gap arrangement	 the officiation in such post cannot be taken into account for considering the seniority. (B) If the initial appointment is not made by following the procedure laid down by the rules but the appointee continues in the post uninterruptedly till the regularisa tion of his service in accordance with the rules	 the period of officiating service will be counted. (C) When appointments are made from more than one source	 it is permissible to fix the ratio for recruitment from the different sources	 and if rules are framed in this regard they must ordinarily be followed strictly. (D) If it becomes impossible to adhere to the existing quota rule	 it should be substituted by an appropriate rule to meet the needs of the situation. In case	 however	 the quota rule is not followed continuously for a number of years because it was impossible to do so the inference is irresistible that the quota rule had broken down. 938 (E) Where the quota rule has broken down and the appoint ments are made from one source in excess of the quota	 but are made after following the procedure prescribed by the rules for the appointment	 the appointees should not be pushed down below the appointees from the other source inducted in the service at a later date. (F) Where the rules permit the authorities to relax the provisions relating to the quota	 ordinarily a presumption should be raised that there was such relaxation when there is a deviation from the quota rule. (G) The quota for recruitment from the different sources may be prescribed by executive instructions	 if the rules are silent on the subject. (H) If the quota rule is prescribed by an executive instruction	 and is not followed continuously for a number of years	 the inference is that the executive instruction has ceased to remain operative. (I) The posts held by the permanent Deputy Engineers as well as the officiating Deputy Engineers under the State of Maharashtra belonged to the single cadre of Deputy Engi neers. (J) The decision dealing with important questions con cerning a particular service given after careful considera tion should be respected rather than scrutinised for finding out any possible error. It is not in the interest of Service to unsettle a settled position. With respect to Writ Petition No. 1327 of 1982	 we further hold: (K) That a dispute raised by an application under article 32 of the Constitution must be held to be barred by principles of res judicata including the rule of constructive res judicata if the same has been earlier decided by a competent court by a judgment which became final. In view of the above and the other findings recorded earli er	 we do not find any merit in any of the civil appeals	 writ petitions and special leave petitions which are accord ingly dismissed. There will be	 however	 no order as to costs. Appeals and Petitions are dismissed.

The parties in these matters are Engineers in the em ployment of the States of Maharashtra and Gujarat. In 1937	 Government of Bombay created two new Provincial Engineering Services known as the Bombay Engineering Service Class I consisting of posts of Chief Engineer	 SUperintending Engi neers	 ExecUtive Engineers and Assistant Engineers Class I	 and the Bombay Engineering Service Class II 901 having officers designated as Deputy Engineers. All the posts were permanent. In 1939	 Rules were made for regulating the methods of recruitment to the said services which directed the recruit ment to be made either by nomination from amongst the stu dents of the College of Engineering	 Pune or by promotion of officers holding inferior posts. A resolution was passed on 21.11.1941 for determination of the seniority of the direct recruits and the promotee officers	 containing only two rules. Rule 2 thereof was to the effect that in case of officers promoted to substantive vacancies	 the seniority would be determined with reference to the date of their promotion to the substantive vacancies. In 1960	 detailed rules for recruitment to Class I and Class 1I Services were framed. In place of nomination from the successful students of College of Engineering	 Pune as direct recruits	 these Rules prescribed for a competitive examination to be held by the Public Service Commission	 and introduced a quota system by fixing a ratio of appointments of direct recruits and promotees. The Rules also made refer ence to promotion	 as Executive Engineers on officiating basis	 and temporary Deputy Engineers and officiating Deputy Engineers. By r. 8 the posts of Deputy Engineers were re organised	 and by sub rule (iii) it was provided that the direct recruits in any year shall in a bunch be placed senior to promotees confirmed during that year. A review of these Rules was later undertaken by the Government and ultimately in partial supersession thereof a fresh set or rules	 were adopted in 1970. In the meantime	 however	 a serious dispute in regard to the interpretation of one of the provisions of the 1960 Rules arose which was settled by this Court in the case of P.Y. Joshi and Others vs The State of Maharashtra and Oth ers	 During the period 1960 70 adequate number of direct recruits were not available	 and a large number of promo tees	 therefore	 had to be appointed to officiate as Deputy Engineers on continuous basis. These appointments were made after following the procedure applicable to regular promo tions	 including consultation with the Public Service Com mission. The strength of the permanent Deputy Engineers was fixed at the total number of (a) the Deputy Engineers con firmed up to the date of commencement of the Rules	 (b) direct recruits to the posts of Deputy Engineers appointed till the date of commencement of the Rules	 and (c) the Deputy Engineers officiating on 30.4.1960; and it was pro vided that no fresh appointments in future would be made to 902 this cadre and the vacancies arising would be transferred to the officers holding subordinate posts detailed in the sub rule in proportions indicated. As per rule 33 of the 1970 Rules	 the seniority list in each cadre in Class I and Class II was to be prepared in two parts one for the confirmed officers and other for those who were not confirmed; and that the confirmed officers would be treated as senior to the unconfirmed officers. Since the direct recruits were all appointed against the permanent posts	 they were reckoned to be senior to the officiating Deputy Engineers irrespective of the period for which they had been working continuously on the Deputy Engineer 's posts. Though the Rules were amend ed in 1972	 there was no departure from the main scheme especially the principle governing seniority. In pursuance of the 1970 Rules seniority lists were prepared. The validity of r. 8(iii) of the 1960 Rules and of r. 33 of the 1970 Rules was successfully challenged as being violative of Articles 14 and 16 of the Constitution. S.B. Patwardhan and Ors. vs State of Maharashtra and Ors. 	 ; In view of the judgment in Patwardhan 's case	 it became necessary to prepare fresh seniority lists. Rules were framed under Article 309 of the Constitution read with section 81(6) of the Bombay Reorganisation Act	 1960	 and were called the Re organised Bombay State Overseers and Deputy Engineers Seniority Lists Rules	 1978. In 1981 further rules called Re organised Bombay State Assistant Engineers and Executive Engineers Seniority Lists Rules	. 1981	 were flamed laying down the rule of determina tion of seniority of the Assistant Engineers and the Execu tive Engineers for the period 1.11.1956 to 30.4.60. These rules have been successfully challenged in the High Court. The main Rules which are the subject matter of the present cases were framed in 1982 under Article 309 of the Constitution laying down the principle for fixing the sen iority for the period dated 1.5.1960 to 20.12.70 and are called the Maharashtra Service of Engineers (Regulation of Seniority and Preparation and Revision of Seniority Lists for Specified Period) Rules	 1982. These rules were framed in view of the decision of the Bombay High Court in S.B. Patwardhan 's case. By including two rules therein Rules 4 and 9	 deleted later fixing rigid quota with retrospective effect	 attempt was made to neutralise the 903 decision and rob the promotees the benefit of their continu ous officiation. For the purpose of fixing the seniority of Executive Engineers and Assistant Engineers for the period commencing from 21.12.1970	 separate rules were framed under Article 309 of the Constitution and are called the Executive Engi neers and Assistant Engineers belonging to the Maharashtra Service of Engineers Class I and the Maharashtra Service of Engineers Class II (Regulation of Seniority and Preparation and Revision of Seniority Lists) Rules	 1983. As a result of a decision of the High Court striking down Sections 4 and 9 of the 1982 Rules	 the 1984 Rules were framed by the Govern ment. The present appeals	 special leave petitions and Writ Petitions challenge the validity of the Rules framed in 1978	 1982	 1983 and 1984. Dismissing all these matters	 this Court	 HELD: 1. The period of continuous officiation by a government servant	 after his appointment by following the rules applicable for substantive appointments	 has to be taken into account for determining his seniority; and sen iority cannot be determined on the sole 'test of confirma tion	 for	 confirmation is one of the inglorious uncertain ties of government service depending neither on efficiency of the incumbant nor on the availability of substantive vacancies. The principle for deciding inter se seniority has to conform to the principles of equality spelt out by Arti cles 14 and 16. If an appointment is made by way of stop gap arrangement	 without considering the claims of all the eligible available persons and without following the rules of appointment	 the experience on such appointment cannot be equated with the experience of a regular appointee	 because of the qualitative difference in the appointment. To equate the two would be to treat two unequals as equal which would violate the equality clause. But if the appointment is made after considering the claims of all eligible candidates and the appointee continues in the post uninterruptedly till the regularisation of his service in accordance with the rules made for regular substantive appointments	 there is no reason to exclude the officiating service for purpose of seniority. Same will be the position if the initial appoint ment itself is made in accordance with the rules applicable to substantive appointments as in the present case. To hold otherwise will be discriminatory and arbitrary. [914G H; 915A D] S.B. Patwardhan vs State of Maharashtra. ; ; 904 Baleshwar Das vs State of U.P.	 [1981] 1 SCR 449; Delhi Water Supply and Sewage Disposal Committee & Ors. R.K. Kashyap & Ors.	 [1989] Supp. 1 SCC 194 and Narender Chaddha 2.1 It is incorrect to say that the 1970 Rules indicate that the officiating posts were not included in the cadre of the Deputy Engineers. It is true that the use of word "promotions" in r. 8(i) of the 1960 Rules is not quite appropriate	 but that by itself cannot lead to the conclu sion that the officiating Deputy Engineers formed a class inferior to that of the permanent Engineers. One cannot attribute fixed connotation to the expression 'promotion ' without reference to the context. The expression has been used in the sense of confirmation. The language used in several other rules is inconsistent with two cadre theory	 and by way of illustration r. 12(a) may be considered. Rules 5 and 24 of the 1970 Rules mention only 4 cadres in Class II namely	 those of Sub Divisional Officers	 Sub Divisional Engineers	 Assistant Engineers Class II and Deputy Engineers and there was no separate cadre of officiating Deputy Engi neers. Rule 12(a) of the 1970 Rules expressly includes some of the officiating Deputy Engineers within the cadre of Deputy Engineers	 although it leaves behind the other offi ciating Deputy Engineers who started officiating later than 30.4.1960. Rule 13 speaks of officers "officiating in the erstwhile cadre of Deputy Engineers" and r. 27 of "officiat ing promotions" which are inconsistent with two cadre theo ry. In r. 33 of the 1970 Rules also two lists were directed to be prepared	 not cadre wise but in each cadre	 clearly indicating that the lists were different from cadres. In r. 8(1) of the 1960 Rules also the different groups were not described as different cadres. They were referred to as "categories" and what the re organisation suggested was with reference to "lists" to be prepared. It will not	 therefore	 be right to equate the lists with cadres. It is true that the Rules have not in express language stated that the officiating posts also will be in the cadre but if all their relevant provisions are considered	 they unmistakably lead to the said conclusion. [918A F] 2.2 Questions of vital importance affecting a very large number of officers in the departments concerned and many disputes have been settled by following the judgment in Patwardhan 's case. In such a situation it is not expedient to depart from the decision lightly. It is highly desirable that a decision	 which concerns a large number of government servants in a particular service and which has been given after careful consideration of the rival contentions	 is respected rather than scrutinised for finding out any possi ble error. It is not in the interest of 905 the service to unsettle a settled position every now and then. [918G H; 919A] 2.3 Even on an independent consideration of the provi sions of the Rules	 and the relevant materials the temporary posts of Deputy Engineers against which promotees officiat ed	 did not form a separate cadre and were additions to the main cadre. These temporary posts were created in pursuance of several resolutions of the State Government and the language used therein amply supports this view. [921A E] S.B. Patwardhan vs State of Maharashtra	 ; and P.Y. Joshi vs State of Maharashtra	 	 followed. State of Gujarat vs C.G. Desai & Ors.	 [1974] 2 SCR 255	 distinguished. Baleshwar Dass vs State of U.P. & Ors.	 [1981] 1 SCR 449	 referred to. 3.1 The quota rule was for the first time introduced by the 1960 Rules. These Rules were introduced through execu tive instructions issued by the State Government. The ratio of 3:1 was fixed for the purpose of "appointment" and not for the strength in the service. It permitted the State Government to exercise its discretion according to the demand of the exigencies	 by using the expression "as far as practicable. " There is no reason to so restrict the scope and meaning of the expression "as far as practicable". The quota rule must he held to be realistic and flexible	 true to life rather than abstractly absolute. [923C H; 924A B] 3.2 When recruitment is from more than one source	 there is no inherent invalidity in introducing quota system	 but the unreasonable implementation of such a rule may attract the frown of the equality clause. Further	 if a rule fixing the ratio for recruitment from different sources is framed	 it is meant to he respected and not violated at the whims of the authority. It ought to be strictly followed and not arbitrarily ignored. This	 of course	 may not prevent the Government from making slight deviations to meet the exigen cies. If it is discovered that the rule has been rendered impracticable	 it should be promptly substituted by an appropriate rule according to the situation. [925A C] 3.3 In the present cases direct recruits were not avail able in adequate number for appointment	 and appropriate candidates in the 906 subordinate rank capable of efficiently discharging the duties of Deputy Engineers were waiting in their queue. The development work of the State peremptorily required experi enced and efficient hands. In the situation the State Gov ernment took a decision to frill up the vacancies by promo tion in excess of the quota	 but only after subjecting the officers to the test prescribed by the rules. All the eligi ble candidates were considered and the opinion of the Public Service Commission was obtained. [925D E] 3.4 If appointments from one source are made in excess of the quota	 but in a regular manner and after following the prescribed procedure	 there is no reason to push down the appointees below the recruits from the other source who are inducted in the Service subsequently. The later appoint ees may have been young students still prosecuting their studies when the appointments from the other source take place and it will be highly inequitable and arbitrary to treat them as senior. Further	 in cases where the rules themselves permit the Government to relax the provisions fixing the ratio	 the position for the appointees is still better; and a mere deviation therefrom would raise a pre sumption in favour of the exercise of the power of relaxa tion. There would he still a third consideration relevant in this context: namely	 what is the conclusion to he drawn from deliberate continuous refusal to follow an executive instruction fixing the quota The inference would be that the executive instruction has ceased to remain operative. In all these cases	 the matter would however he subject to the scrutiny of the Court on the ground of mala fide exercise of power. All the three circumstances mentioned above which are capable of neutralising the rigours of the quota rule are present in the cases	 and the principle of seniority being dependant on continuous officiation cannot be held to have been defeated by reason of the ratio fixed by the 1960 Rules. 1926C G] P.C. Sethi vs Union of India	 ; and N.K. Chauhan vs State of Gujart	 ; 	 relied on. S.B. Patwardhan vs State of Maharashtra	 ; 	 affirmed. P.S. Mahal vs Union of India	 ; and V.B. Badami etc. vs State of Mysore & Ors.	 [1976] 1 SCR 815	 distinguished. Paramjit Singh Sandhu vs Ram Rekha & Ors. 	 ; ; 907 A.K. Subraman vs Union of India	 [1975] 2 SCR 979; Bishen Sarup Gupta vs Union of India	 [1975] Supp. SCR 491 and S.G. Jaisinghani vs Union of India & Ors.	 ; 	 referred to. It is not possible to hold that the principle of seniority being dependant on continuous officiation will not apply to certain groups of the officers. The reasons for rejecting the case of the appellants in Patwardhan 's case are equally applicable to all the promoted Deputy Engineers including those who were earlier Sub Divisional Engineers and Sub Divisional Officers	 as well as all the directly recruited Deputy Engineers. The suggested division of the two groups into further subcategories will result in illegal discrimination. [929F G] 5. Rules 4 and 9 of the 1982 Rules were rightly struck down by the High Court and consequently the 1984 Rules were correctly framed and have to be upheld as legal and valid. [930A B] 6. It is well established that the principles of res judicata are applicable to Writ Petitions. A dispute raised by a petition under Article 32 of the Constitution must be held to be barred by principles of res judicata including the rule of constructive res judicata underlying Explanation IV of Section 11 of the Code of Civil Procedure	 if the same has been earlier decided by a competent court by a judgment which became final. [932E; 933D E] Daryao & Ors. vs State of U.P. & Ors. 	 ; and Forward Construction Co. vs Prabhat Mandal	 (Regd.) Andheri & Ors. 	 ; 	 relied on.