Summarize the following court judgment. Civil Appeal No. 43(NT) of 1975. 306 From the Judgment and Order dated 23.1.1974 of the Gujarat High Court in Income Tax Reference No. 78 of 1970. T.A. Ramachandran	 Mrs. J. Ramachandran and S.C. Patel for the Appellant. C.M. Lodha	 M.N. Tandon and Ms. A.S. Subhashini	 for the Respondent. The Judgment of the Court was delivered by VENKATACHALIAH	 J. This appeal by the assessee	 The Alembic Chemicals Works Co. Ltd.	 arises out of and are directed against the judgment dated 23.1.1974	 of the High Court of Gujarat in Income Tax Reference 78 of 1970	 answer ing in favour of the Revenue a question of law referred to it under Section 256(1) of the Income Tax Act	 1961	 (Act) by the Income Tax Appellate Tribunal. On 8.6.1961	 the assessee	 a company engaged in the manufacture of antibiotics and pharmaceuticals was granted licence for the manufacture	 on its plant	 of the well known antibiotic	 penicillin. In the initial years of its venture the assessee was able to achieve only moderate yields from the pencillin producing strains used by it which yielded only about 5000 units of penicillin per millilitre of the culturemedium. In the year 1963	 with a view to increasing the yield of penicillin	 the assessee negotiated with M/s. Meiji Seika Kaishna Limited ("Meiji" for short)	 a reputed enterprise engaged in the manufacture of antibiotics in Japan	 which agreed to supply to the assessee the requisite technical know how so as to achieve substantially higher levels of performance of production of more than 10	000 units of penicillin per millilitre of 'cultured broth ' with the aid of better technology and process of fermentation and with better yielding penicillin strains developed by Meiji. The negotiations culminated in an agreement dated 9.10.1963	 whereunder Meiji	 in consideration of the 'once for all ' payment of 50	000 U.S. dollars (then equivalent to Rs.2	39	625) agreed to supply to the assessee the "sub cultures of the Meiji 's most suitable penicillin producing strains"	 the technical information	 know now and written description of Meiji 's process for fermentation of penicil lin alongwith a flow sheet of the process on a pilot plant; the design and specifications of the main equipments in such pilot plant; arrange for the visits to and training at assessee 's expense	 307 of technical representatives of the assessee to Meiji 's plant at Japan and to advise the assessee in the large scale manufacture of penicillin for a period limited to 2 years from the effective date of the agreement. It was also stipu lated that the technical know how supplied by Meiji was to be kept confidential and secret by the assessee which was prohibited from parting with the technical know how in favour of others or to seek any patent for the process. In the proceedings for assessment to Income tax for the assessment year 1964 65 the assessee claimed that Rs.2	39	625 paid under the agreement to 'Meiji ' was one laid out wholly and exclusively for the purpose of the business and claimed its deduction as a revenue expenditure. The Income tax Officer	 on the view that the expenditure was for the acquisition of an asset or advantage of an enduring benefit	 held it to be a capital outlay and declined the deduction. This view was affirmed by the Appellate Asst. Commissioner in the assessee 's first appeal. The Income tax Appellate Tribunal	 Ahmedabad Bench	 dismissed the further appeal of the assessee holding that the arrangements with Meiji envisaged the setting up of a large commercial plant for the production of the antibiotic modelled on the lines of the pilot plant and that	 there fore	 the out lay could not be treated as an expenditure laid out on and for purposes of the existing business	 but must be regarded as one incurred for a new venture on a new process with a new technology on a new type of plant. The Tribunal held that the payment was 'once for all payment ' and was made for the acquisition of a capital asset. The Tribunal inter alia held: "The sub cultures and the information design and flow sheet etc.	 were to be fur nished once for all. Meiji also agreed to advise the assessee in respect of any diffi culty the assessee may encounter in applying the subcultures and informations obtained by the assessee from Meiji to the large scale manufacture of penicillin. It is apparent from the agreement and the correspondence which has been made available to us that Meiji agreed to give the designs etc.	 not only for a pilot plant but for the manufacture of penicillin according to Meiji 's process on commercial scale. The assessee has to put in a larger plant modelled on the pilotplant." " . . It is in consideration for Meiji 's agreeing to 308 supply the assessee with complete details of the technical know how	 the design	 subcul tures	 flow sheet and written descriptions of the process once for all that the assessee paid to Meiji the stipulated sum of $ 50	000." " . . It would thus appear that the payment was made for acquiring a capital asset in the shape of technical know how and other allied information. It was not made in the course of carrying out of an existing business of the assessee but was for the purpose of setting up a new plant and a new process. It would	 therefore	 appear that the revenue authorities have rightly treated the payment as of capital nature." " . . The process which the assessee took over from Meiji was not the same as it was working heretofore. In the present case the outlay was incurred for a complete replacement of the equipment of the business inasmuch us a new process with a new type of plant was to be put up in place of old process and old plant . . . ." (Underlining Supplied) 4. At the instance of the assessee the Tribunal stated a case and referred the fol lowing question of law for the opinion of the High Court: "Whether the sum of Rs.2	39	625 was a revenue expenditure admissible to the asses see for the purpose of computation of its total income?" The High Court by the judgment under appeal answered the question in the negative and against the assessee. This part of the judgment is assailed by the assessee in CA 43 of 1975. The reasoning of the High Court in support of its conclusion was on the following lines: " . It is true that the expenditure was manifestly laid out for the purpose of obtain ing benefits and advantages such as sub cul tures of penicillin producing strains	 design of a pilot and exchange of technical personnel with a view to acquiring know how. But the finding of the Tribunal	 as we 309 read it	 is that all the benefits which asses see received under the agreement were as a part of the transaction which was undertaken with the ultimate view of a setting up a new plant and a new process. In view of the find ings recorded by the Tribunal	 no conclusion other than that the expenditure was incurred once and for all with a view to bringing into existence an asset or advantage for the endur ing benefit of the manufacturing trade of the assessee is possible. The expenditure was incurred for introducing a new process of manufacturing and with a view to installing a new plant	 even if not immediately then at a later stage	 and on that conclusion the only possible answer to the first question referred to us can be in the negative and against the assessee." (Emphasis Supplied) Before the High Court	 the assessee also moved an application under Section 256(2) of the Act ITA No. 24 of 1971 for a direction to the Tribunal to refer another question of law	 also stated to arise out of the order of the Tribunal. The question of law respecting which the supplementary reference was sought was this: "Whether there was any evidence or material before the Tribunal to hold that (1) a completely new plant with a completely new process and new technical know how was ob tained by the assessee from Messrs Meiji under the said agreement	 dated 9.10.1963; and (2) to work out that process separate plant or machinery had to be designed	 constructed	 installed and operated? The High Court dismissed this application observing that the Tribunal had no where recorded a finding to the effect that a completely new plant was obtained by the assessee from Meiji and that the finding of the Tribunal that under the agreement the assessee had obtained a new process and a new technical know now from Meiji was not without evidence. Against the dismissal of ITA 24 of 1971 by the High Court	 the assessee has preferred Civil Appeal No. 44 of 1975. On 24.2.1987	 this Court while directing the Tribunal to draw up a supplementary statement of the case and refer for the opinion of this Court the further question of law which	 according to the assessee	 arose out of the Tribu nal 's order and which was the subject matter of the asses see 's appeal in C.A. 44 of 1975	 however	 disposed of that 310 appeal formally	 leaving the question of law arising out of the supplemental reference to be considered in the present appeal i.e. CA No. 43 of 1975. The Tribunal has since sub mitted the supplementary statement of the case and has referred that question of law also. This is how both the questions of law	 are now before us. While in regard to the first question the correctness of the opinion rendered by the High Court requires to be examined	 the second question has to be answered for the first time as the reference is called by this court directly. We have heard Shri T.A. Ramachandran	 learned Senior Counsel for the assessee and Shri Lodha	 learned senior counsel for the revenue. In computing the income chargeable under the head "Profits and Gains of Business or Profession"	 section 37 of the 'Act ' enables the deduction of any expenditure laid out or expended wholly and exclusively for the purpose of the business or profession	 as the case may be. The fact that an item of expenditure is wholly and exclusively laid out for purposes of the business	 by itself	 is not sufficient to entitle its allowance in computing the income chargeable to tax. In addition	 the expenditure should not be in the nature of a capital expenditure. In the infinite variety of situational diversities in which the concept of what is capital expenditure and what is revenue arises it is well nigh impossible to formulate any general rule	 even in generality of cases sufficiently accurate and reasonably comprehensive	 to draw any clear line of demarcation. Howev er	 some broad and general tests have been suggested from time to time to ascertain on which side of the line the out lay in any particular case might reasonably be held to fall. These tests are generally efficacious and serve as useful servants; but as masters they tend to be over exact ing. One of the early pronouncements which serves to indicate a broad area of distinction is City of London Contract Corporation vs Styles	 where Bowen	 L.J. indicated that the out lay on the "acquisition of the con cern" would be capital while an outlay in "carrying on the concern" is revenue. In Vallambrosa Rubber Co. vs Farmer	 Lord Dunedin suggested as 'not a bad crite rion ' the test that if the expenditure is 'once for all ' it is capital and if it is 'going to recur every year it is revenue. In the oft quoted case on the subject	 viz	 British Insulated Helsby Cables Ltd. vs Atherton	 Viscount Cave L.C. said: "But when an expenditure is made	 not only once and for 311 all	 but with a view to bringing into exist ence an asset or an advantage for the enduring benefit of trade	 I think that there is very good reason (in the absence of special circum stances leading to an opposite conclusion) for treating such an expenditure as properly attributable not to revenue but to capital." .8. In Assam Bengal Cement Co. Ltd. vs Commissioner of Income tax	 [1955]27 ITR 34	 this Court observed: "If the expenditure is made for acquiring or bringing into existence an asset or advantage for the enduring benefit of the business it is properly attributable to capital and is of the nature of capital expenditure. If on the other hand it is made not for the purpose of bring ing into existence any such asset or advantage but for running the business or working it with a view to produce the profits	 it is a revenue expenditure." "The aim and object of the expendi ture would determine the character of the expenditure whether it is a capital expendi ture or a revenue expenditure." In Sitalpur Sugar Works Ltd. vs Commissioner of Income tax	 [1963] 49 ITR (SC) 160; Lakshmiji Sugar Mills Co. Ltd. vs Commissioner of Income tax	 and in Travancore Cochin Chemicals Ltd. vs Commissioner of Income tax	 the enunciation made in Assam Bengal Cement Company 's case 	 which in turn	 referred with approval to Lord Cave 's dictum was affirmed. In Sun News Papers Ltd. & Associated News Papers Ltd. vs Federal Commissioner of Taxation; 	 Dixon J while indicating that the distinction between revenue and capital corresponds with the distinction between the "busi ness entity	 structure or organisation set up or established for the earning of profit" on the one hand and "the process by which such an organization operates to obtain regular returns" on the other	 however	 went on to say that: "The business structure or entity or organiza tion may assume any of an almost infinite variety of shapes and it may be difficult to comprehend under one description all the forms in which it may be manifested . " 312 The learned judge further observed: " . . There are	 I think	 three matters to be considered	 (a) the character of the advan tage sought	 and in this its lasting qualities may play a part	 (b) the manner in which it is to be used	 relied upon or enjoyed	 and in this and under the former head recurrence may play its part and (c) the means adopted to obtain it; that is	 by providing a periodical reward or outlay to cover its use or enjoyment for periods commensurate with the payment or by making a final provision or payment so as to secure future use or enjoyment . . " 9. In Regent Oil Co. Ltd. vs Strick	 Lord Reid emphasised the futility of a strict application of and exclusive dependence on any single principle in the search for the true position and pointed out the difficulty arising from taking too literally the general statements made in earlier cases and seeking to apply them to a different case which their authors certainly did not have in mind. The Learned Lord also identified as another source of difficulty the tendency in some cases to treat some one criterion as paramount and to press it to its logical conclusion without proper regard to the other factors in the case. Lord Reid further said: "So it is not surprising that no one test or principle or rule of thumb is paramount. The question is ultimately a question of law for the court	 but is a question which must be answered in the fight of all the circumstances which it is reasonable to take into account	 and the weight which must be given to a par ticular circumstance in a particular case must depend rather on common sense than on strict application of any single legal principle. " The question in each case would necessarily be whether the tests relevant and significant in one set of circum stances are relevant and significant in the case on hand also. Judicial metaphors	 it is truly said	 are narrowly to be watched	 for	 starting as devices to liberate thought they end often by enslaving it. The non determinative quali ty	 by itself	 of any particular test is highlighted in B.P. Australia vs Commr. of Taxation of the Commonwealth of Australia	 Lord Pearce said: "The solution to the problem is not to be found by 313 any rigid test or description. It has to be derived from many aspects of the whole set of circumstances some of which may point in one direction	 some in the other. One considera tion may point so clearly that it dominates other and vaguer indications in the contrary direction. It is a common sense appreciation of all the guiding features which must provide the ultimate answer . " (Emphasis Supplied) The idea of 'once for all ' payment and 'enduring bene fit ' are not to be treated as something akin to statutory conditions; nor are the notions of "capital" or "revenue" a judical fetish. What is capital expenditure and what is revenue are not eternal varities but must needs be flexible so as to respond to the changing economic realities of business. The expression "asset or advantage of an enduring nature" was evolved to emphasise the element of a sufficient degree of durability appropriate to the context. The words of Rich J. in Herring vs Federal Commissioner of Taxation	 1946.72 CLR 543	 dealing with an analogous provision in sec. 51 of Income tax Assessment Act of Australia may be re called. " . . Lord Cave L.C.	 in using the phrase 'enduring benefit ' in British Insulated and Helsby Cables Ltd. vs Atherton	 1926 A.C. 205	213 (HL)	 was not thinking of advantages that are permanent. There is a difference between the lasting and the everlasting. The time over which the thing 'endures ' is a matter of degree and one element only to be considered. Horses in the old days and motor trucks in these days are plant and their acquisition for the purpose of transport in business usually involves a capital expendi ture. But the horses were not immortal any more than the trucks have proved to be . . " 10. Shri Ramachandran submitted that the approach to the question by the Tribunal was influenced by an erroneous assumption that Meiji 's agreement envisaged the imperative of a totally new plant	 for the exploitation of Meiji 's improved fermentation technology. Learned counsel invited our attention to the following passage in the order of the Tribunal where this postulate is found: "On the other hand	 a completely new plant with a completely new process and a completely new technical know how was obtained by the assessee from Meiji and it 314 was in consideration of obtaining this techni cal know how that the assessee made the pay ment of $ 50	000." Shri Ramachandran submitted that the Tribunal had failed to take into account that even before the agreement	 the assessee had set up a plant for the production of penicillin at an out lay of more Rs.66 lakhs and that the purpose of the agreement with Meiji was only to increase the yield; of penicillin and that no new venture envisaging the setting up of a new plant was ever intended by the assessee. The pro duction of penicillin which was the established line of business of the assessee	 says learned counsel	 was to be improved upon with the use of an improved process of fermen tation with new penicillin producing strains isolated and developed by Meiji so as to increase the unit yield of penicillin per milli litre of the culture medium. The supply of the technical know how and the flow sheet of the process and the written description of the specifications of the pilot plant from Meiji were incidental to and for the effec tive exploitation of the high penicillin yielding strains of the culture to be supplied by Meiji. Learned counsel submit ted that the whole range of the operations envisaged by the agreement	 pertained to the area of the "profit earning process" and not the "profit earning machinery or apparatus". The cost relationship between what was involved in the improvisation of the process and the investment on the plant did	 says counsel	 indicate that the extant "profit earning machinery" was not sought to be supplanted. Learned counsel also urged that there was no material for the Tribunal to hold that the use of new process and tech nology from Meiji amounted to a new venture not already in the line of the assessee 's existing business or that it required the erection of a new plant discarding and sup planting the huge investment already existing. Learned counsel submitted that it was no body 's case that with the introduction of the Meiji process of fermentation with improved penicillin strains the existing plant and machinery of over Rs.66 lakhs had become obsolete and irrelevant or that the assessee had had to set up an altogether new plant to work out the improvised Meiji process of fermentation. Learned counsel for the Revenue	 however	 sought to maintain that all the criteria relevant to the question indicated that the assessee had acquired a new technical know how for a new process which required the setting up of a new plant. There was	 according to Shri Lodha	 a new venture based on a new technology and know how of unlimited duration which required a new plant for its commercial exploitation. There were	 according to Shri Lodha	 both the acquisition of 315 an enduring asset	 and the commencement of a new venture. On a consideration of the matter we are persuaded to hold that there was no material for the Tribunal to record the finding that the assessee had obtained under the agree ment a 'completely new plant ' with a completely new process and a completely new technical know how from Meiji. Indeed	 the High Court recognised the fallacy in this assumption of the Tribunal that a completely new plant was obtained by the assessee	 though	 however	 the High Court attributed the inaccuracy to what it considered to be some inadvertence or misapprehension on the part of the Tribunal in that regard. But the High Court was inclined to the view that a complete ly new process and technical know how was obtained from Meiji under the agreement. Certain assumptions fundamental to	 and underlying	 the approach of the High Court are that the agreement dated 9.10.1963 envisaged a new process and a new technology so alien to the extant infrastructure	 equip ment	 plant and machinery in the assessee 's enterprise as to amount to an entirely a new venture unconnected with and different from the line of assessee 's extant business. It is in that sense that the expense was held not incurred for the purposes of the day to day business of the assessee but for acquiring a new capital asset. The business of the assessee from the commencement of its plant in 1961	 it is undisputed	 was the manufacture of penicillin. Even after the agreement the product manufac tured continued to be penicillin. The agreement with Meiji stipulated the supply of the "most suitable sub cultures" evolved by Meiji for purposes of augmentation of the unit yield of penicillin milli litres of the culture medium. Scientific literature on the bio synthesis of penicillin indicates that penicillin is derived from a fermentation process. Some penicillins are obtained from direct fermenta tion and some others by a combination of fermentation and subsequent chemical manipulation of the fermentation product. The manufacturing process	 it is stated	 consists of four processes: Fermentation	 isolation	 chemical modifi cation and finishing. Referring to the common basis of commercial production of penicillin in the New Encyclopaedia Britannica	 (Micropaedia	 Vol. VII) it is mentioned: "penicillin	 antibiotic	 the discovery of which in 1928 by Sir Alexander Fleming marked the beginning of the antibioticera. Fleming observed that colonies of Staphylococ cus aureus (the pus producing bacterium) failed to grow in those areas of a culture that had been accidentally contaminated 316 by the green mold Penicillium notatum. After isolating the mold	 he found that it produced a substance capable of killing many of the common bacteria that infect human beings. This antibacterial substance	 to which Fleming gave the name penicillin	 was liberated into the fluid in which the mold was grown. This proc ess is the basis of all commercial production of penicillin . . " (p. 850) (Emphasis Supplied) In Encyclopedia of Chemical technology (Kirk Othmer) III Edn. 2 it is found mentioned: " . The specific characteristics of the industrial microbial strains	 media	 and fermentation conditions cannot be described in detail since these facts are considered trade secrets. The origin of strains	 and general principles of culture maintenance	 fermenta tion equipment	 innoculum preparation	 media	 and fermentation conditions for penicillin and cephalosporin production	 are public knowledge and are reviewed here. . . . . . Fleming 's original strain of P. notatum provided only low yields of penicillin . . . Superior penicil lin producing strain of P. chrysogenum have since been obtained by random screening of variant strains following mutation induction. All of the present day high yielding industri al strains are descendants of the NRRL 1951 strain. . " "Once a high yielding strain has been isolat ed	 it is essential that the organism be maintained so that it remains viable and capable of producing the antibiotic at its original rate (54) . . . Under suit able conditions highyielding strains can be preserved for many years without loss of viability or antibiotic producing ability . . " (p. 899 90) We are inclined to agree with Shri Ramachandran that there was no material for the Tribunal to hold that the area of improvisation was not a part of the existing business or that the entire gamut of the 317 existing manufacturing operations for the commercial produc tion of penicillin in the assessee 's existing plant had become obsolete or inappropriate in relation to the exploi tation of the new sub cultures of the high yielding strains of penicillin supplied by Meiji and that the mere introduc tion of the new bio synthetic source required the erection and commissioning of a totally new and different type of plant and machinery. Shri Ramachandran is again fight in the submission that the mere improvement in or updating of the fermentation process would not necessarily be inconsistent with the relevance and continuing utility of the existing infra structure	 machinery and plant of the assessee. It would	 in our opinion	 be unrealistic to ignore the rapid advances in Researches in antibiotic medical microbiology and to attribute a degree of endurability and permanance to the technical know how at any particular stage in this fast changing area of medical science. The state of the Art in some of these areas of high priority. research is constantly updated so that the know how cannot be said to be the element of the requisite degree of durability and none phemerality to share the requirements. and qualifications of an enduring capitalasset. The rapid strides in science and technology in the field should make us a little slow and circumspect in too readily pigeon holing an outlay	 such as this as capital. The circumstance that the agreement in so far as it placed limitations on the right of the assessee in dealing with the know how and the conditions as to non partibility	 confidentiality and secrecy of the know how incline towards the inference that the right pertained more to the use of the know how than to its exclusive acquisi tion. In the present case	 the principal reason that influ enced the option of the High Court was that the initiation and exploitation of the new process brought in their wake a new venture requiring an altogether new plant. We are afraid	 this view may not be justified. Clauses 2	 4 and 6 of the agreement provide: "(2) For and in consideration of the subcultures	 design	 flow sheet and written description to be furnished by Meiji to ALEM BIC PURSUANT to paragraph (1) hereof	 Alembic shall pay to MEIJI in advance and in lump sum	 such as amount as MEIJI is able to collect Fifty thousand U.S. Dollars ($ 50	000) net in Tokyo after deducting any taxes and charges to be imposed in India upon MEIJI with respect to the said payment to MEIJI. " 318 "4. MEIJI will give advice	 to the extent considered necessary be MEIJI	 on any diffi culty ALEMBIC may encounter in applying the subcultures and informations obtained by ALEM BIC from MEIJI to the large scale manufacture. The above provision shall be in force after MEIJI 's receipt of the amount set forth in paragraph (2) hereof until the end of two (2) years from the effective date of this agree ment . " "(6) Any of the subcultures and informations obtained by ALEMBIC from MEIJI shall be re garded as strictly confidential by ALEMBIC and its personnel and shall be used by ALEMBIC only in its Penicillin G plant in India	 and shall not be disclosed to any other person	 firm or agency	 governmental or private. Alembic shall take all reasonable steps to ensure that such subcultures and information will not be communicated. ALEMBIC shall take all possible precautions against the escape from its premises of the strain obtained from MEIJI of propagated therefrom. ALEMBIC shall not apply for any patent to any country in relation to any of the subcultures and information obtained by ALEMBIC from MEIJI." As notified earlier the Tribunal in the course of its order	 held: " . Meiji agreed to give the designs etc.	 not only for a pilot plant but for the manufacture of penicillin according to Meiji 's process on commercial scale. The assessee has to put in a larger plant modelled on the pilotplant." (Emphasis Supplied) Having regard to the terms of Clause 4 of the agreement	 this conclusion is non sequitur. The improvisation in the process and technology in some areas of the enterprise was supplemental to the existing business and there was no material to hold that it amounted to a new or fresh venture. The further circumstance that the agreement pertained to a product already in the line of assessee 's established business and not to a new product indicates that what was stipulated was an improvement in the operations of the existing business and its efficiency and profitability not removed from the area of the day to day business of the assessee 's established enterprise. 319 14. It appears to us that the answer to the questions referred should be on the basis that the financial outlay under the agreement was for the better conduct and improve ment of the existing business and should	 therefore	 be held to be a revenue expenditure. Reference may also be made to the observations of this Court in C.I.T.v. CIBA of India Ltd.; 	 at 705. There is also no single definitive criterion which	 by itself	 is determinative whether a particular outlay is capital or revenue. The 'once for all ' payment test is also inconclusive. What is relevant is the purpose of the outlay and its intended object and effect	 considered in a common sense way having regard to the business realities. In a given case	 the test of 'enduring benefit ' might break down. In Commissioner of Income tax	 Bombay vs Associated Cement Co. Ltd.	 (JT 282 2 287 at 290) this Court said: " . . As observed by the Supreme Court in the decision in Empire Jute Co. Ltd. vs Com missioner of Income Tax	 [1980] 124 I.T.R.S.C.p. 1 that there may be cases where expenditure	 even if incurred for obtaining an advantage of enduring benefit	 may	 none the less	 be on revenue account and the test of enduring benefit may break down. It is not every advantage of enduring nature acquired by an assessee that brings the case within the principles laid down in this test. What is material to consider is the nature of the advantage in a commercial sense and it is only where the advantage is in the capital field that the expenditure would be disallowable on an application of this test . " 15. In the result	 for the foregoing reasons the appeal succeeds and is allowed and the question of law referred to the High Court for its opinion in Income Tax Reference No. 78 of 1970 is answered in the affirmative and against the revenue. The judgment under appeal is set aside. 	 Likewise	 the supplementary question of law raised in ITA 24 of 1971 before the High Court and now constituting the subject matter of the supplementary reference made by the Tribunal to this Court is answered in the negative and against Revenue. The appeal is accordingly allowed	 but with no order as to costs. G.N. Appeal al lowed.

The appellant assessee	 a company engaged in the manu facture of penicillin	 in order to increase its production	 entered into an agreement with a Japanese firm (Meiji) for supply of sub cultures of penicillin producing strains	 technical know how	 training	 written description of the process on a pilot plant	 design and specifications of the main equipment in such pilot plant	 and to advise the asses see in the largescale manufacture of penicillin for a limit ed period of two years. As per the agreement	 the assessee paid Rs.2	39	625 to Meiji and claimed the same as revenue expenditure in its Income tax assessment for the assessment year 1964 65. Disallowing the claim the Income Tax Officer held that the expenditure was for the acquisition of an asset or advantage of an enduring benefit and thus a capital outlay. The Appel late Assistant Commissioner confirmed the order of the Income Tax Officer. The further appeal of the assessee was dismissed by the Income Tax Appellate Tribunal holding that the payment made to Meiji was 'once for all payment ' made for the acquisition of a capital asset. At the instance of the assessee	 the Tribunal referred to the High Court	 the question as to whether the sum paid to Meiji was a revenue expenditure. The High Court answered the question in the negative. The present appeal is against that order of the High Court. The assessee also moved an application before the High Court 303 seeking a direction to the Tribunal to refer another ques tion of law as to whether a new plant was obtained or in stalled by the assessee consequent upon the agreement. Declining to interfere	 the High Court observed that the Tribunal has not recorded a finding to the effect that a completely new plant was obtained by the assessee and the Tribunal 's decision that the assessee	 had obtained a new process and a new technical know how from Meiji was not without evidence. Against the above order of the High Court	 the assessee preferred an appeal to this Court	 which was formally dis posed of with a direction to the Tribunal to draw up a supplementary statement of the case and refer for the opin ion of this Court	 the further question of law as sought for by the assessee; and such a question to be considered in the present appeal. On behalf of the assessee	 it was submitted that the Tribunal was influenced by an erroneous assumption that the agreement	 envisaged the setting up of a new plant	 whereas the objective of the agreement was only to increase the yield of penicillin in the existing plant itself. The Revenue contended that there was a new venture based on a new technology and know how of unlimited duration which required a new plant for its commercial exploration. Allowing the appeal	 HELD: 1. The financial outlay under the agreement was for the better conduct and improvement of the existing business 'and should	 therefore	 be held to be a revenue expenditure. There is also no single definitive criterion which	 by itself	 is determinative whether a particular outlay is capital or revenue. The 'once for all ' payment test is also inconclusive. What is relevant is the purpose of the outlay and its intended object and effect	 considered in a common sense way having regard to the business reali ties. The rapid strides in science and technology in the field should make this Court a little slow and circumspect in too readily pigeon holing an outlay	 such as this	 as capital. The circumstance that the agreement in so far as it placed limitations on the right of the assessee in dealing with the know how and the conditions as to non partibility	 confidentiality and secrecy of the know how incline towards the inference that the right pertained more to the use of the know how than to its exclusive acquisition. [319A	 B C; 317D E] CIT vs CIBA of India Ltd.	 ; ; CIT	 Bombay vs 304 Associated Cement Co. Ltd.	 JT 282 (2) 287	 relied on. The idea of 'once for all ' payment and 'enduring benefit ' are not to be treated as something akin to statuto ry conditions; nor are the notions of "capital" or "revenue" a judicial fetish. What is capital expenditure and what is revenue are not eternal verities but must needs be flexible so as to respond to the changing economic realities of business. The expression "asset or advantage of an enduring nature" was evolved to emphasise the element of a sufficient degree of durability .appropriate to the context. [313C] Herring vs Federal Commissioner of Taxation	 ; 	 referred to. In computing the income chargeable under the head "Profits and Gains of Business or Profession"	 section 37 of the Income tax Act enables the deduction of any expenditure laid out or expended wholly and exclusively for the purpose of the business or profession	 as the case may be. The fact that an item of expenditure is wholly and exclusively laid out for purposes of the business	 by itself	 is not suffi cient to entitle its allowance in computing the income chargeable to tax. In addition	 the expenditure should not be in the nature of a capital expenditure. In the infinite variety of situational diversities in which the concept of what is capital expenditure and what is revenue arises it is well nigh impossible to formulate any general rule	 even in generality of cases sufficiently accurate and reasonably comprehensive	 to draw any clear line of demarcation. Howev er	 some broad and general tests have been suggested from time to time to ascertain on which side of the line the out lay in any particular case might reasonably be held to fail. These tests are generally efficacious and serve as useful servants; but as masters they tend to be over exact ing. The question in each case would necessarily be whether the tests relevant and significant in one set of circum stances are relevant and significant in the case on hand also. [310C F; 312G] City of London Contract Corporation vs Styles	 ; Vallambrosa Rubber Co. vs Farmer	 ; British Insulated Helsby Cables Ltd. vs Atherton	 ; Assam Bengal Cement Co. Ltd. vs Commissioner of Income tax	 ; Sitalpur Sugar Works Ltd. vs Commissioner of Income tax	 [1963] 49 ITR (SC) 160; Laksh miji Sugar Mills Co. Ltd. vs Commissioner of Income tax	 ; Travancore Cochin Chemicals Ltd. vs Commissioner of Income tax	 ; Sun News Papers 305 Ltd. & Associated News Papers Ltd. vs Federal Commissioner of Taxation	 ; ; Regent Oil Co. Ltd. vs Strick	 and B.P. Australia vs Commr. of Taxa tion of the Commonwealth of Australia	 ; re ferred to. 4. The improvisation in the process and technology in some areas of the enterprise was supplemental to the exist ing business and there was no material to hold that it amounted to a new or fresh venture. The further circumstance that the agreement pertained to a product already in the line of assessee 's established business and not to a new product indicates that what was stipulated was an improve ment in the operation of the existing business and its efficiency and profitability not removed from the area of the day to day business of the assessee 's established enter prise. [318G H] 5. There was no material for the Tribunal to record the finding that the assessee had obtained under the agreement a 'completely new plant ' with a completely new process and a completely new technical know how from Meiji. Indeed	 the High Court recognised the fallacy in this assumption of the Tribunal that a completely new plant was obtained by the assessee	 though	 however	 the High Court attributed the inaccuracy to what it considered to be some inadvertence or misapprehension on the part of the Tribunal in that regard. But the High Court was inclined to the view that a complete ly new process and technical know how was obtained from Meiji under the agreement. Certain assumptions fundamental to	 and underlying	 the approach of the High Court are that the agreement envisaged a new process and a new technology so alien to the extent infra structure	 equipment	 plant and machinery in the assessee 's enterprise as to amount to an entirely new venture unconnected with and different from the line of assessee 's extant business. It is in that sense that the expense was held not incurred for the purposes of the day to day business of the assessee but for acquiring a new capital asset. But mere improvement in or updating of the fermentation process would not necessarily be inconsistent with the relevance and continuing utility of the existing infra structure	 machinery and plant of the assessee. [315A D; 317B] The New Encyclopaedia Britannica	 Micropaedia	 Vol. II; Encyclopedia of Chemical Technology	 Kirk Othmen	 3rd Edn. 2	 referred to.