Post-evaluation determination of a program's generalizability

The literature on the generalizability of program effects focuses exclusively on the a priori development of evaluation designs which enable certain generalizations to be made. Due to a variety of factors, new questions of a program's generalizability often arise only after the completion of the formal evaluation study. This paper suggests secondary analysis procedures which can be employed using existing evaluation data to estimate a program's generalizability when followup field studies are not feasible.