Abstract:
Methods and systems for obtaining a random sample from a batch of delivery items include determining what type of items are to be sampled, how many items are in the batch, and where the items in the batch are located. The items are typically located in several places as they undergo a sorting and delivery process. The number of items needed for the random sample, and the location(s) of the items to be included in the random sample is determined. The determined number of items are pulled from the batch at the specified location(s). The pulled items forming the random sample may then be analyzed to determine whether the batch conforms to information describing the batch and/or standards applicable to the batch.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
   This application claims the benefit of U.S. Provisional Application No. 60/272,761, filed Mar. 5, 2001, titled METHOD FOR OBTAINING A RANDOM SAMPLING, the disclosure of which is expressly incorporated herein by reference. 

   DESCRIPTION 
   Background 
   Currently, many companies that generate a large amount of outgoing mail have their mail verified and accepted by the United States Postal Service (“USPS”) at their mail production facilities rather than delivering it to a post office for acceptance processing. These in-house verification and acceptance centers are often referred to as Detached Mail Units (“DMU”). Typically, the company will present one or more mailings to a DMU where they will be processed and sent for delivery. These companies are responsible for reporting information regarding the mailing to USPS and for insuring that the mailing conforms to USPS standards. This includes insuring that the barcode information, sort information, and/or rate information is accurate and conforms to USPS standards. 
   USPS periodically sends postal clerks to the DMUs to verify that the mailer provided accurate information and that the mailing comports with USPS standards. Typically, an automated verification device, such as a Mailing Evaluation Readability Lookup Instrument (“MERLIN”), is used to verify large amounts of mail efficiently. In most cases, rather then check the entire mailing, the clerk selects a random sample of each mailing and uses that sample to verify the entire mailing. In order for the sample to be an accurate representation of the entire mailing, however, it must be a statistically valid random sample. Providing a standard procedure for a clerk to obtain such a sample has proven difficult because of the fact that ach mailing may have different properties. 
   For example, mailings prepared at DMUs can vary by size, location, type of mail, and ordering. With respect to size, a company may process small, medium, or large mailings. The size of the mailing alters the amount of mail need for a statistically valid random sample. 
   With respect to location, a mailing may reside in several locations throughout the DMU. When a clerk arrives to verify a mailing, it may be in processing, stored on the floor, or already partially delivered. These locations must also be taken into account in determining a statistically valid random sample. 
   With respect to type of mail, a mailer may mail letters, flats, packages, or a combination of all three. A letter mailer generally works with large volumes of letter mail. A flat mailer generally works with magazines, catalogues, and other “flat” mail. This may affect the amount of mail that needs to be sampled. Therefore, this also must be taken into account in determining a statistically valid random sample. 
   With respect to ordering, a mailer may also be a “list mailer.” Mail from list mailers is presorted by computer based on a predetermined order. Other mailers, however, may use optical scanners and bar code sorters. In this case, the order of the mail cannot be determined until the mail has been sorted. The ordering of the mail may also affect the choice of a statistically valid random sample. 
   These variations make it difficult for a clerk to apply a single random sampling method to different mailings. Therefore, it is desirable to provide a method for obtaining a random sampling that takes into account these variations. 
   SUMMARY 
   Methods in accordance with an embodiment of the invention provide a method of obtaining a random sample from a plurality of mail pieces. The method comprises determining at least one of the following for the plurality of mail pieces: the type of mail pieces and the number of mail pieces in the plurality of mail pieces. The method also comprises determining the location of the mail pieces, determining a random sample of mail pieces based on at least one of the type of mail pieces and the number of mail pieces, specifying the location of the mail pieces in the random sample, and pulling the random sample of mail pieces from the plurality of mail pieces. 
   Systems in accordance with an embodiment of the invention provide a system for obtaining a random sample from a plurality of mail pieces. The system comprises a first determining component configured to determine at least one of the following for the plurality of mail pieces: the type of mail pieces and the number of mail pieces in the plurality of mail pieces. The system also comprises a second determining component configured to determine the location of the mail pieces, a third determining component configured to determine a random sample of mail pieces based on at least one of the type of mail pieces and the number of mail pieces, a specifying component configured to specify the location of the mail pieces in the random sample, and a pulling component configured to pull the random sample of mail pieces from the plurality of mail pieces. 
   Systems in accordance with another embodiment of the invention provide a computer readable medium containing instructions for controlling a computer system to perform a method of obtaining a random sample from a plurality of mail pieces. The method comprises determining at least one of the following for the plurality of mail pieces: the type of mail pieces and the number of mail pieces in the plurality of mail pieces. The method also comprises determining the location of the mail pieces, determining a random sample of mail pieces based on at least one of the type of mail pieces and the number of mail pieces, specifying the location of the mail pieces in the random sample, and pulling the random sample of mail pieces from the plurality of mail pieces. 
   Systems in accordance with another embodiment of the invention provide a system for obtaining a random sample from a plurality of mail pieces. The system comprises a first determining means for determining at least one of the following for the plurality of mail pieces: the type of mail pieces and the number of mail pieces in the plurality of mail pieces. The system also comprises a second determining means for determining the location of the mail pieces, a third determining means for determining a random sample of mail pieces based on at least one of the type of mail pieces and the number of mail pieces, a specifying means for specifying the location of the mail pieces in the random sample, and a pulling means for pulling the random sample of mail pieces from the plurality of mail pieces. 
   Methods in accordance with another embodiment of the invention provide a method of verifying mail information. The method comprises presenting a plurality of mail pieces to a mail unit and determining at least one of the following for the plurality of mail pieces: the type of mail pieces and the number of mail pieces in the plurality of mail pieces. The method also comprises determining the location of each mail piece, determining a random sample of mail pieces based on at least one of the type of mail pieces and the number of mail pieces, specifying the location of the mail pieces in the random sample, pulling the random sample of mail pieces from the plurality of mail pieces, and verifying the random sample of mail pieces for conformance with a specified standard. 
   Systems in accordance with another embodiment of the invention provide a system for verifying mail information comprising a presenting component configured to present a plurality of mail pieces to a mail unit, a first determining component configured to determine at least one of the following for the plurality of mail pieces: the type of mail pieces and the number of mail pieces in the plurality of mail pieces, a second determining component configured to determine the location of each mail piece, a third determining component configured to determine a random sample of mail pieces based on at least one of the type of mail pieces and the number of mail pieces, a specifying component configured to specify the location of the mail pieces in the random sample, a pulling component configured to pull the random sample of mail pieces from the plurality of mail pieces, a verifying component configured to verify the random sample of mail pieces for conformance with a specified standard. 
   Systems in accordance with another embodiment of the invention provide a computer readable medium containing instructions for controlling a computer system to perform a method of verifying mail information. The method comprises presenting a plurality of mail pieces to a mail unit, determining at least one of the following for the plurality of mail pieces the type of mail pieces and the number of mail pieces in the plurality of mail pieces, determining the location of each mail piece, determining a random sample of mail pieces based on at least one of the type of mail pieces and the number of mail pieces, specifying the location of the mail pieces in the random sample, pulling the random sample of mail pieces from the plurality of mail pieces, and verifying the random sample of mail pieces for conformance with a specified standard. 
   Systems in accordance with another embodiment of the invention provide a system for verifying mail information comprising a presenting means for presenting a plurality of mail pieces to a mail unit, a first determining means for determining at least one of the following for the plurality of mail pieces: the type of mail pieces and the number of mail pieces in the plurality of mail pieces, a second determining means for determining the location of each mail piece, a third determining means for determining a random sample of mail pieces based on at least one of the type of mail pieces and the number of mail pieces, a specifying means for specifying the location of the mail pieces in the random sample, a pulling means for pulling the random sample of mail pieces from the plurality of mail pieces, and a verifying means for verifying the random sample of mail pieces for conformance with a specified standard. 
   Methods in accordance with another embodiment of the invention provide a method of determining whether to obtain a sample from a plurality of mail pieces. The method comprises determining at least one of the following for the plurality of mail pieces: the type of mail pieces, the number of mail pieces in the plurality of mail pieces, and the entity who prepared the plurality of mail pieces. The method also comprises assigning a risk factor to the plurality of mail pieces based on one of the type of mail pieces, the number of mail pieces in the plurality of mail pieces, and the entity who prepared the plurality of mail pieces, and obtaining a sample number of mail pieces if the risk factor exceeds a predetermined risk level. 
   Systems in accordance with another embodiment of the invention provide a system for determining whether to obtain a sample from a plurality of mail pieces. The system comprises a determining component configured to determine at least one of the following for the plurality of mail pieces: the type of mail pieces, the number of mail pieces in the plurality of mail pieces, and the entity who prepared the plurality of mail pieces. The system also comprises an assigning component configured to assign a risk factor to the plurality of mail pieces based on one of the type of mail pieces, the number of mail pieces in the plurality of mail pieces, and the entity who prepared the plurality of mail pieces, and an obtaining component configured to obtain a sample number of mail pieces if the risk factor exceeds a predetermined risk level. 
   Systems in accordance with another embodiment of the invention provide for a computer readable medium containing instructions for controlling a computer system to perform a method of determining whether to obtain a sample from a plurality of mail pieces. The method comprises determining at least one of the following for the plurality of mail pieces: the type of mail pieces, the number of mail pieces in the plurality of mail pieces, and the entity who prepared the plurality of mail pieces. The method also comprises assigning a risk factor to the plurality of mail pieces based on one of the type of mail pieces, the number of mail pieces in the plurality of mail pieces, and the entity who prepared the plurality of mail pieces, and obtaining a sample number of mail pieces if the risk factor exceeds a predetermined risk level. 
   Systems in accordance with another embodiment of the invention provide for a system for determining whether to obtain a sample from a plurality of mail pieces, comprising a determining means for determining at least one of the following for the plurality of mail pieces: the type of mail pieces, the number of mail pieces in the plurality of mail pieces, and the entity who prepared the plurality of mail pieces, an assigning means for assigning a risk factor to the plurality of mail pieces based on one of the type of mail pieces, the number of mail pieces in the plurality of mail pieces, and the entity who prepared the plurality of mail pieces, and an obtaining means for obtaining a sample number of mail pieces if the risk factor exceeds a predetermined risk level. 
   Additional aspects of the invention are disclosed and defined by the appended claims. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate several embodiments of the invention and together with the description, serve to explain the principles of the invention. 
     In the drawings: 
       FIG. 1  is a flow diagram illustrating the processing stages of a mailing in accordance with one embodiment of the invention; 
       FIG. 2  illustrates a production stage at a DMU in accordance with an embodiment of the invention; 
       FIG. 3  illustrates a floor and trailer stage at a DMU in accordance with an embodiment of the invention; and 
       FIG. 4  is a flow chart illustrating the verification of mail at a DMU in accordance with one embodiment of the invention. 
   

   DESCRIPTION OF THE EMBODIMENTS 
   Methods and systems in accordance with the present invention provide methods of and systems for obtaining a random sampling. In one implementation, the method will be computer program, which may be referred to as a “random selection sampling program.” The random selection sampling program will help the clerk to randomly select statistically accurate samples from mailings at DMU to verify a mailing. 
     FIG. 1  is a flow diagram illustrating the processing stages of a mailing in accordance with one embodiment of the invention. As shown in  FIG. 1 , a mailing  100  is first placed in production  110 . In one implementation, production  110  includes the printing, processing, barcoding, and sorting of mailing  100 . Following production  110 , mailing  100  is placed on floor  120 . In one implementation, floor  120  may be a staging area for mail prior to verification. Next, mailing  100  is moved from floor  120  to trailers  130 . In one implementation, trailers  130  include vehicles to deliver mailing  100 . These implementations are merely exemplary, and other implementations may also be used. 
   When a clerk arrives at a DMU to take a random sample of mailing  100  for verification, mailing  100  may be in any one of stages  110 ,  120 , and  130  or may be spread out among stages  110 ,  120 , and  130 . In order to take a statistically accurate random sampling, a random selection sampling program will need to have the opportunity to choose a sample from each of these stages. These implementations are merely exemplary and other implementations may also be used. 
     FIG. 2  illustrates a production stage at a DMU in accordance with an embodiment of the invention. As described in  FIG. 1 , a mailing begins in the production stage. During the production stage, the mailing may be printed and placed in envelopes in preparation for mailing. In one implementation, as shown in  FIG. 2 , a mailer&#39;s plant may comprise five production machines, such as Machine  1   210 , Machine  2 , 215 , Machine  3   220 , Machine  4   225 , and Machine  5   230 . A production operation, however, may comprise any number of production machines. 
   In this implementation, a mailing  1   202  has been placed in machine  1   210  and machine  2   215 , a mailing  2   204  has been placed in machine  3   220  and machine  4   225 , and a mailing  3   206  has been placed in machine  5   230 . Any mailing may be placed in any machine. Following processing in the machines, the mailings are placed in containers to await verification. As shown in  FIG. 2 , machine  1   210  and machine  2   215  place a portions of mailing  1   202  in containers  235  and containers  240 , respectively. Likewise, machine  3   220  and machine  4   225  are placing portions of mailing  2   204  in containers  245  and containers  250 , and machine  5  is placing mailing  3   206  in container  255 . Containers  235 ,  240 ,  245 ,  250 ,  255  may include mail sacks, trays, or any other type of container. In one implementation, containers  235 ,  240 ,  245 ,  250 ,  255  containers then are moved to a staging area. These implementations are exemplary, and other implementations may also be used. 
   In one implementation, in order for a clerk to take a sample of a mailing that is either partially or wholly in production, the clerk will survey each of the machines to determine what mail is in production and how long the mail will be in production on each of the machines. This information will be used to determine a random sample. This implementation is exemplary, and other implementations may also be used. 
     FIG. 3  illustrates a floor and trailer stage at a DMU in accordance with an embodiment of the invention. As shown in  FIG. 3 , following production, mailings may be staged on the floor in containers  310 ,  320 , and  330 . In one implementation, mailing  1  is contained in containers  310 , mailing  2  is contained in containers  320 , and mailing  3  is contained in containers  330 . In this implementation, the clerk will determine the amount of mail staged in containers on the floor. This information will be used in determining a random sample. This implementation is exemplary, and other implementations may also be used. 
   From the floor, a mailing may be moved to vehicles. As shown in  FIG. 3 , trailer  340  and trailer  380  contain containers for mailing  1 , trailer  360  and trailer  370  contain containers for mailing  2 , and trailer  350  contains containers for mailing  3 . In one implementation, the clerk will determine the amount of mail staged in trailers. This information will be used to determine a random sample. This implementation is exemplary, and other implementations may also be used. 
   As shown in  FIGS. 1–3 , a mailing at a DMU may be located in production, in containers on the floor, and/or in containers in a trailer. In order to provide an accurate sample, a random selection sampling program will need to include mail located in all of these locations in the pool from which to take the sample. 
     FIG. 4  is a flow chart illustrating the verification of mail at a DMU in accordance with one embodiment of the invention. As shown in  FIG. 4 , the process comprises four parts: Mailer  402 , DMU  404 , MERLIN  406 , and Processing and Delivery Center (“P &amp; DC”)  408 . Mailer  402  includes functions to be performed by the mailer. DMU  404  includes functions performed at the detached mail unit. MERLIN  406  includes functions performed by MERLIN, or some other mail verification device at the DMU. P &amp; DC  408  includes functions performed at the processing and delivery center. This implementation is merely exemplary, and other implementations may also be used. 
   The process begins with present mailing  412 . Present mailing  412  includes the presentation of the mailing mail at the DMU. Next, USPS will conduct an initial verification  414 . 
   Initial verification  414  includes determining information regarding the amount and type of mail in a mailing. This information will then be compared with information provided by the mailer. In one implementation, the clerk will use a worksheet to record the number of mailings at the DMU, the amount of mail in each mailing, the type of mail in each mailing, and the location of the mail in each mailing. For example, in the implementation shown in  FIG. 2  and  FIG. 3 , the clerk would record that there were three mailings: mailing  1   202 , mailing  2   204 , and mailing  3   206 . The clerk would then record the amount of mail in machine  1   210 , machine  2   215 , machine  3   220 , machine  4   225 , and machine  5   230 . Next, the clerk would record the amount of mail in containers  235 ,  240 ,  245 ,  250 , and  255 . The clerk will then record the amount of mail located on the floor in containers  310 ,  320 , and  330 . Finally, the clerk will determine the amount of mail in trailers  340 ,  350 ,  360 ,  370 , and  380 . 
   In another implementation, the clerk may also record the type of mail in each of these mailings and the type of mail at each location. The type of mail may be important in determining how many units are to be sampled. In one implementation, rather than counting the amount of mail in each location, the amount of mail will be recorded in terms of a unit, such as trays, sacks, or containers. However, the number of mail pieces in the unit may vary depending on the type of mail. For example, a tray of letter mail can hold up to about 400 pieces, but a tray of flat mail may only hold 90 pieces. Likewise, a sack of flat mail may hold about 125 pieces depending on the volume of the mail. Packages, on the other hand, may be kept in containers, which may only hold a few pieces. Therefore, when entering in a unit, the clerk must also enter in the type of mail, so that the random selection sampling program has an accurate picture of the amount of mail in a mailing. 
   In one implementation, after determining the amount, type, and location of the mailing, the clerk will obtain postage statements from the mailer regarding the mailing. These postage statements may include information regarding the amount and type of the mailing as reported by thee mailer. The clerk will then compare the information provided by the mailer to that determined during the verification. The initial verification may also include determining if the bulk fees are paid and if funds are available for each mailing. If the information provided by the mailer is inaccurate, then the mailing does not pass initial verification  416 . If the information provided by the mailer is accurate, then the mailing does pass initial verification  416 . 
   If the mailing does not pass initial verification  416 , the next stage is notify mailer  418 . Notify mailer  418  includes informing the mailer of the deficiencies in the information provided by the mailer or in the funds available for the mailing. The next stage is correct mail  420 . Correct mail  420  includes correcting the information regarding the mailing and may include the payment of additional postage fees. If the mailer corrects the errors, the mail will again be returned to initial verification  414 . If the mailer does not correct any errors, then the mailing is returned  422 . 
   If the mailing does pass initial verification, then the next stage is to run the random selection sampling program  424 . Random selection sampling program  424  includes entering the mail information determined during initial verification  414  into random selection sampling program  424 . Random selection sampling program will then determine a sample of the mailing to verify mailing information. 
   In one implementation, the clerk will enter the mail information determined during initial verification  414  into a computer that will run random selection sampling program  424 . In one implementation, random selection sampling program  424  can receive information from a clerk by prompting through a series of questions. In another implementation, the clerk will also enter information regarding the amount of time available for sampling that day. Because the clerk may work at a DMU for only a couple hours a day or may only have a limited amount of time available to sample the mailing, the program may need to take the time available into account when determining a sample size. These implementations are merely exemplary, and other implementations may also be used. 
   Next, random selection sampling program  424  will determine what mailings need to be sampled and when to sample. Based on the clerk&#39;s schedule, the program will determine the amount of mail to be sampled, what mail to sample, the location of that mail, and when to sample the mail. In one implementation, the sample size will be determined based on the size of the mailing. 
   For example, in one implementation, if the mailing comprises less than 10,000 mail pieces, the sample size may, for example, be 500 mail pieces. If the mailing comprises more than 10,000 mail pieces, the sample size may, for example, be 1,000 mail pieces. In this implementation, random selection sampling program  424  will choose samples in blocks of 250 mail pieces. For example, if the sample comprises 500 pieces, random selection sampling program  424  will randomly select two locations from which to take 250 pieces each. Likewise, if the sample comprises 1000 pieces, random selection sampling program  424  will randomly select four locations from which to take 250 pieces each. These locations will be chosen randomly based on the information inputted by the clerk and may include mail in production, mail staged on the floor, or mail in trailers. The sample may also specify locations in certain containers. In another implementation, random selection sampling program  424  may choose random samples only from mail that is in production. These implementations are merely exemplary, and other implementations and other sample sizes may also be used. 
   In another implementation, the program will also determine if there are any risk factors associated with each of the jobs. For example, the mail may be of a single product which will have substantially identical features, for example, a magazine or catalog. In this instance, there are not significant variations between the mail pieces. For example, there would be little variation in weight for a particular magazine. However, in a presort environment, where a mailer picks up letter mail from hundreds of different customers, there may be significant variation in the mail. This variation creates greater risk. The risk may be used in deciding whether and how often a mailing needs to be sampled. The program may also need to know the volume of the job for the day. If the mailing is small, USPS will be at a lesser risk of revenue loss than for a large mailing. For example, there is less risk of revenue loss in accepting a 10,000 piece mailing compared to a million piece mailing. USPS may also want to include a risk factor for each mailer, based on the mailer&#39;s history of compliance with USPS requirements. The program may include all or some of the various risks described above, to determine an overall risk. This risk may be used in deciding whether and how often a mailing needs to be sampled. 
   In another implementation, mail that is staged and mail that is in production will be sampled separately and treated as separate mailings. In another implementation, the results of the samplings will be merged to obtain a single result. Using this approach, a weighting factor may be used. These implementations are merely exemplary, and other implementations may also be used. 
   In another implementation, the random selection sampling program may also show how to expand the sample if additional units are needed. Also, there may be situations where more mailings are selected for sampling than the clerk actually has time to sample. This may be because of restrictions in the clerk&#39;s work day or the unavailability of the mailings at an appropriate time, i.e., the mailing that USPS thought was going to be ready at a particular time was not ready. In these instances, the program can scale down the sampling, or the number of mailings to be sampled. 
   Following random selection sampling program  424 , the clerk determines if MERLIN is scheduled  424 . As described above, MERLIN is an automated verification system. MERLIN verifies barcode information, sort information, and/or rate information to determine if a mailer accurately reported this information and to determine if the mailing comports with USPS standards. Other verification systems may also be used. 
   If the mailing is not to be verified, the next stage is accept mail  428 . Accept mail  428  includes accepting the mail for delivery. The next stage is then to enter postage statement into permit system  430 . Enter postage statement into permit system  430  includes entering the rate, barcode, and sort information provided by the mailer regarding the mailing. Based on this information, the next stage is to print dispatch certificate  432 . A dispatch certificate may include the rate, barcode, and sort information. Finally, the mail is released to processing and distribution  434 . 
   If the mailing is to be verified, the sample description chosen by random selection sampling program  424  will be outputted to the clerk. With respect to mail in production, the program output will instruct the clerk what mailing to sample, what machine to sample, and when to sample. In one implementation, the program may break down time into ten minute segments. For example, in  FIG. 2 , the program may instruct the clerk to pull a sample from machine 5 at 10 minutes after the hour. These implementations are merely exemplary and other implementations may also be used. 
   With respect to mail located on the floor of the DMU or in a mail vehicle, as shown in  FIG. 3 , the random selection sampling program will identify which containers and vehicles to sample from. For example, in one implementation, the random selection sampling program may identify two containers  310 , a single container  310 , and/or a subset of mail pieces in container  310 . These implementations are merely exemplary, and other implementations may be used. 
   In one implementation, rather than trying to have the clerk sample from multiple locations at the same time, it might be preferable to have the clerk sample the staged mail at one time, the production mail at another time, and ultimately combine that information together. 
   The clerk will then pull the mail sample for analysis out  440 . Pull sample for analysis  440  includes physically removing a subset of mail pieces, as specified by random selection sampling program  424 . The subset, or sample, will then be prepared and staged for analysis by MERLIN  442 ,  444 . Next, the clerk will enter mailing data  446 . Enter mailing data  446  includes entering the data about the mailing into MERLIN, including tray label information and a description of the mail  446 . 
   The next stage is load &amp; run mail  446 . Load &amp; run mail  446  includes loading and running the sample in MERLIN. Next, MERLIN will analyze the results  450 . Analyze the results  450  includes determining if the mailing conforms with USPS standards and if the mailer accurately reported the mail information, as described more completely in P.C.T. Patent Application Ser. No. PCT/US02/05098, entitled “Method and System for Continuous Sampling of Mail,” filed Mar. 5, 2002, and assigned to the assignee of the present application. The disclosure of the aforementioned application is expressly incorporated herein by reference. 
   Following analyze results  450 , MERLIN will print interim reports and summary reports  452  detailing the results of analyze results  450 . Each of these reports reflects the results on a particular sample of mail, and can be combined to get an overall report for the mailing. In one implementation, USPS may sample the mailing multiple times, or may be sampling different segments. If the mailing passes the MERLIN verification process, the mail will be accepted  454  and the mail will move to enter the postage statement into permit system  430 , followed by print dispatch certificate  432 , and releasing the mail for distribution. If it does not pass, the mailer will be notified  456 . 
   In one implementation, the random selection sampling program may be integrated within a verification device, such as MERLIN. In another implementation, this program may reside on a separate device. By putting the program on MERLIN or a similar device, it would be possible to have a single device that can handle the random sampling of mailings as well as performing in-depth analysis on the mailings. In another implementation, the random selection sampling program may be implemented using any suitable software or programming languages. For example, the program could be implemented using Excel, Access, or Visual Basic, among others. These implementations are merely exemplary, and other implementations may be used. 
   The random selection sampling program can also be used outside of DMUs, such as in Business Mail Entry Units (“BMEU”). The program could be used in other industries where sampling of production is done to determine whether quality standards are being met. It could also be used by purchasers who want to determine if the products they purchase are meeting their quality standards. 
   Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.