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…

Responding to doubts about the validity of test results that showed the Pittsburgh School District's school improvement project to be highly successful, the district validated its results by administering a different test to a representative sample of students in secure conditions. (MCG)