n. a portion of a body records that is selected for permanent retention, in addition to a random sample, to ensure documentation of specific categories of information that might otherwise not be captured v. to select or collect an oversample of records


The point of an oversample is to collect a larger sample of a certain subset of a series to ensure that adequate documentation is available for future research in that area of interest. An oversample, thus, is created when an appraisal concludes that research in that narrow area is likely. A potential drawback of oversampling is that the effort required to collect the sample significantly increases the time needed to collect the overall sample.