The purpose of this paper is to review some of the methods used for the impact evaluation of Demonstrator-Developer projects and to promote the meta-analysis approach. Four examples of attempts to collect and analyze impact data from adopters are presented, one of which used the meta-analysis approach. In this example, each adopter collected pre…

Four influential studies on school effectiveness reported by Brookover and Lezotte (1979), Edmonds and Frederiksen (1979), Phi Delta Kappa (1980), and Rutter and others (1979) are limited in their usefulness as recipes for creating effective schools by the following four issues: (1) The four studies differ in their definition of what…