This report summarizes the complex research literature on quantitative methods for assessing how impacts of educational interventions on instructional practices and student learning differ across students, educators, and schools. It also provides technical guidance about the use and interpretation of these methods. The research topics addressed…

Self-instructional booklets simulating computer-assisted instruction (CAI) were used to teach four basic concepts in science to first graders in three treatment groups which received different types of feedback--hints, correct answers, and right or wrong. A control group received neither instruction nor feedback. A multiple-choice test was…