As a baseline measurement of what is being learned about computers in California, the skills, knowledge, attitudes, and experiences of a representative sample of 17,861 high school seniors was assessed in December 1982. Developed by a committee of experts in computer technology drawn from the public school system, universities, and industry, the test permitted reporting of scores for 30 distinct computer science and computer literacy objectives. Nearly all groups studied showed a low level of understanding of the basic concepts of computer technology. Students who reported substantial programming experience were exceptions, and demonstrated a higher level of knowledge. Comparison of results with those from an earlier survey by the National Assessment of Educational Progress showed considerable gains in awareness of computer technology over the last 5 years. Boys appeared to have more access to and experience with computers than girls. Both of these factors were associated with higher test scores. Students from families with more education tended to score higher than those from families with less education. This report includes 23 tables, 3 figures, and a list of computer literacy objectives for students. (Author/LMM)