Compares the performance of ninth-grade students on 30 common test items given during the First (1970) and Second (1983) International Science Study, including differences related to sex. Findings, among others, show that overall, students in 1983 scored higher than their predecessors in 1970. (JN)

A self-paced format is used to teach physical science on three levels: (1) regular program; (2) challenging readings and experiments for academically gifted; and (3) modified textbooks for students with reading/learning difficulties. (Author/JN)