Discusses the need for awareness of real and potential problems in educational evaluation approaches, kinds of problems there are with true experimental designs and with quasi-experimental designs, and the criteria applied by the Joint Dissemination Review Panel to its review of educational programs. (MF)

Problems with conducting randomized field experiments in education are explored. Focus is on problems encountered while evaluating a group of dropout prevention projects. Project planners were asked to manipulate the subject eligibility criteria until they identified as eligible three to four times as many students as they could serve. They were…