This study investigated the impact of integrated learning systems, problem solving software, and simulation software on elementary students' reading performance. Results indicate students entering fourth through sixth grade profited more from instruction supplemented by problem-solving and simulation software than from skills instruction. Results…

Research investigations on teacher training effects have focused almost exclusively on differences between group means. The present paper suggests that several interesting and important research questions might be answered by examining student variability both within and between classrooms. Student variability might be considered as an outcome to…