The Comprehensive Tests of Basic Skills, Expanded Edition (CTBS), was administered in 1984 to students in the District of Columbia Public Schools. This report includes: (1) an overview covering the purpose of testing, a description of the subject areas tested by the CTBS, and a glossary of technical terms; (2) a narrative and tabular summary of the CTBS results; (3) an item category analysis summary and comparison; and (4) a report of test results for individual schools. Over three-fourths of the students from grades 3, 6, 8, 9, and 11 were tested in six areas: reading, language, mathematics, reference skills, science, and social studies. The results indicated that third graders exceeded the national norm in all areas and improved in all areas except mathematics. Sixth graders met or exceeded the national norm in all areas, for the first time. Eighth grade results for language, mathematics, and reading improved in all three areas; however, overall achievement was seven months below the national norm. Ninth graders, likewise, improved in all areas but remained below the national norm. Eleventh graders' mathematics scores were the same in 1983 and in 1984. In other areas, achievement was lower this year and remained two years below the national norm. (GDC)