This manual is a guide to the special education diagnostic process and covers the various stages of evaluation, interpretation, diagnosis, prescription, and remediation. Test information includes: explanations of the most commonly used diagnostic tests, coverage of the areas measured by each test, interpretation of test patterns for commonly used measures, diagnostic categories frequently exhibited by test patterns, strengths and weaknesses of each test, and how results/scores are evaluated for each test. The 14 sections cover: (1) an introduction to assessment; (2) methods of gathering information; (3) the Wechsler Scales of Intelligence; (4) other intellectual assessment measures; (5) achievement assessment measures; (6) perceptual measures; (7) language, psychological, and social adaptive measures; (8) early childhood, hearing impaired, occupational and physical therapy, and bilingual tests; (9) identification of possible high-risk children; (10) understanding a student's behavior during testing; (11) the parents' role in the assessment process; (12) writing and developing an Individualized Education Plan; and (13) classroom remediation techniques. Section 14 presents seven appendices including names and addresses of publishers, a test reference guide, terminology and definitions, and special education abbreviations. (Contains 64 references.) (DB)