This paper reports the problems involved in measuring the extent to which the practice in program sites matches model theory formulated in Head Start Planned Variation. The main focus in studying program implementation is the question of internal validity, whether the children in the HSPV programs actually receive the treatment being evaluated.…

Two related problems are discussed: developing a methodology which (1) will not require full commitment of a local education agency to new techniques which may be ineffective in local settings and (2) will allow graceful abandonment of a new technology that may be proved ineffective. An example is discussed. (CTM)

This report is a retrospective account of a single research project conducted between 1973 and 1976 which involved a field study of the administrative feasibility of vouchers for skill training in the Work Incentive Program (WIN) in Portland, Oregon. (The program was designed to change relationships among clients, WIN staff, and training vendors,…