This report presents test results derived from the student testing that was conducted in 1983-84 under the aegis of the California Assessment Program (CAP). All third, sixth, eighth, and twelfth grade students in California public schools were tested in reading, written language, and mathematics. The highlight of the 1983-84 expansion of CAP was the implementation of a first-time test in grade eight: the Survey of Academic Skills Grade 8. Results of the new test are included in each of the content areas of this report. A pilot study was conducted in the spring of 1984 to develop a statewide direct writing assessment. The report's findings included the following: (1) California third graders are slightly below the national average in reading and written language and slightly above in mathematics; (2) sixth graders are right at the national average in reading and written language and substantially above it in mathematics; (3) twelfth graders are below the national averages in written language, reading, and mathematics. Chapters III through V include detailed reports of the areas of reading, written expression, and mathematics, as well as conclusions and recommendations of the statewide advisory committee. Supplementary information is given about students' habits concerning homework, reading, and television watching. Chapters VI and VII assess the future of science, and history-social science expansion of the grade eight test. Chapter VIII describes results of a variety of equating studies that compared California students with a variety of national and international samples of students at each grade level. The appendix lists members of assessment advisory committees. (LMO)