This study examines the nature of the highly variable black-white difference across diverse tests and indicates the major systematic source of this between-population variation, namely, Spearman's g. Eleven large-scale studies (discussed in the appendix), each one comprising anywhere from 6 to 13 diverse tests, show a significant and substantial…

Describes performance criteria for users of computer assisted instruction (CAI) that are used to provide users with feedback about their performance relative to other users. This study evaluated 146 novice users on their percentages of correct responses, time required for completion, and number of times the CAI tutorial was performed. (LRW)

The study reported in this paper quantitatively integrated the recent research findings on ability grouping in order to generalize about these effects on student achievement and student self-concept. Meta-analysis was used to statistically integrate the empirical data. The relationships among various experimental variables including grade level,…