The Institute of Education Sciences has funded more than 100 experiments to evaluate educational interventions in an effort to generate scientific evidence of program effectiveness on which to base education policy and practice. In general, these studies are designed with the goal of having adequate statistical power to detect the average…

Reviews the role of statistical significance testing, and argues that dominance of such testing is dysfunctional because significance tests do not provide the information that many researchers assume they do. Possible reasons for the persistence of statistical significance testing are discussed briefly, and ways to moderate negative effects are…

This article describes some insights of the author based on 20 years experience in using the educational research and development process. Problems and strategies related to planning, developing a prototype, and evaluating educational programs and instructional materials are discussed. (Author/JAZ)