Customers who place a standing order for the Tests in Print series or the Mental Measurements Yearbook series will receive a 10% discount on every volume. To place your standing order, please call 1-800-848-6224 (in the U.S.) or 919-966-7449 (outside the U.S.). The Mental Measurements Yearbooks are widely regarded as essential references for users and developers of tests. Each yearbook contains reviews of commercially available tests published or revised since the previous edition. A biennial publication schedule for yearbooks and supplements was introduced in 1988 to facilitate access to test evaluation information and better meet the needs of test consumers. The Supplement to the Thirteenth Mental Measurements Yearbook contains original reviews of tests published or revised since the 1998 edition of the Mental Measurements Yearbook. Tests are listed in alphabetical order for easy reference. Indexes of titles, classified subjects, names, acronmys, and scores, as well as an index and a directory of publishers, are included. A helpful indexing system integrating references across Buros Institute publications is also provided.