n.an appraisal technique in which a portion of a body of records is chosen for permanent retention through a process that employs a preset pattern of selection to produce a sample of the wholeHindus, Hammett, and Hobson 1979, 8Because of these complex docketing systems, we reconsidered the use of random numbers and considered using systematic sampling based on last digits of docket numbers.Boles 1981, 127Used thoughtfully, the mathematics can be coupled with simplified sampling techniques, such as systematic sampling, to obtain, at minimal expense, samples of known properties.Bradsher 1988, 106By the first week of March, Dollar’s team developed a methodology to appraise the FBI's records that involved systematic sampling to identify case files to be inspected. The archivists would examine the selected files and record their characteristics on a data collection sheet. . . A statistical profile of each classification would be developed from these sheets to aid in making appraisal recommendation.Lyle 2004, 8Common forms of systematic sampling include: alphabetical, numerical and chronological samples (i.e., taking every nth record in order of alphabet, number or date), and physical samples (e.g., the “fat file method,” where files are selected according to thickness).