The "Mental Measurements Yearbook" (MMY) series has provided researchers and practitioners with availability and evaluative information about commercially available English-language tests for over 50 years. However, two myths exist that are believed by some users of these resources. The first myth is that there are some minimum quality criteria that determine the inclusion of a test in the MMY series. The second myth is that each volume represents an exhaustive listing of all commercially available instruments. The purpose of this paper is to document the test identification process that locates tests for review in the MMY series, and to articulate the criteria that these tests must meet to be reviewed in the MMY series. Commercially available English-language tests are eligible. A test that has been listed in one volume will not normally be reviewed again. No minimum standard of quality is applied, and reviewers do not do their own testing, relying instead on information supplied by the publisher. The new publication schedule for the MMY series is explained, and plans for new products are outlined. The MMY series has the potential to be an invaluable resource for instrument identification and critique. Educational researchers need to be informed about the utility of the product. The publication history of the MMY and an explanation of the MMY database are included in table form. (SLD)