Discusses an adaptive diagnostic test used as part of an instructional program in signed-number arithmetic on the PLATO system. Findings indicated that differences in prior and subsequent instructional methods affected the learning of more advanced materials and produced lower achievement scores on posttests. Thirty-two references are listed. (MER)

Three adaptive models encompassing variations of instructional support, incentives, and context of presentations were developed and validated through eight separate studies which compared the teaching of statistics under computer-managed instruction or teacher-managed systems. Results indicate instructional support adaptations were effective, but…