A review of the literature was conducted to describe the field of program evaluation, to identify useful sources of information on the topic, and to outline concepts and methodologies that have been proposed for planning and conducting evaluations of education and training programs. The results of the review showed that the failures of early program evaluations led to new organizations that attempted to clarify the field and improve the effectiveness of evaluators. Several sources of information on program evaluation are recommended reading for those who are preparing to conduct evaluation activities. Since the 1960s, evaluation researchers have expanded the concept and definition of training program evaluation and have assembled a substantial number of new methods, tools, and strategies that are valuable to practitioners. The most promising predictor of success in program evaluation is proper planning. Evaluators should work closely with program decision-makers and sponsors from the planning stage throughout the life of the training program. Formative evaluation should be conducted throughout the program. Summative measures should be conducted on training programs only after they have become fully operational. (Contains 73 references.) (KC)