This bulletin attempts to explain the use and limitations of regularly the process of selecting educational areas which should receive additional interpret adequately their meaning to parents and students. A companion publication "Understanding Testing Purposes and Interpretations for Pupil Development," also prepared by HEW, was issued in 1960. A general discussion of the development of a standardized test is followed by consideration of specific types of tests, including intelligence or scholastic aptitude tests and achievement tests. Scoring a multiple-choice type test, the accuracy of test results, and the analysis of class achievement are also discussed. A section on classroom interpretation of test scores provides helpful suggestions on how to handle the interpretation of this material with students and parents. An extensive list of selected references is included. (TA)