Information about the Delaware Educational Assessment Program and the performance of Delaware public school students during 1986-87 as measured by a nationally-normed standardized achievement test are presented. The presentation is designed for use by the educational community and the general public. Program features include: (1) statewide standardized testing in grades 1 through 8 and 11 in reading, English, and mathematics; (2) supplemental testing in science and social studies for 11th graders; (3) reporting of individual achievement progress to parents; (4) calculation of test data at the school, district, and state levels by grade and subject area; and (5) analysis of test results by school district staff and the development of a plan to remedy identified weaknesses. Student performance data are used for diagnosis of individual student strengths and weaknesses, placement of students in instructional groups or programs, guidance and counseling, identification of curricular and instructional weaknesses, instructional planning, program evaluation, and implementation of research studies. The program initially used the California Achievement Tests, but in 1983-84 adopted the Comprehensive Tests of Basic Skills. Results from 1986-87 are presented by content area, high school program type, and selected other factors. District average scores for reading, language, mathematics, and total battery are presented by grade level. Fourteen data tables and 10 graphs are included. (TJH)