Productive dialogue is informed best by multiple and diverse voices. Five seasoned evaluators, representing a range of evaluation perspectives, offer their views in two- to three-page discussant contributions. These individuals were asked to reflect and comment on the previous chapters in the spirit of critical review as a key source of evidence…

"Theory as Method: Small Theories of Treatments," by Mark W. Lipsey, is one of the most influential and highly cited articles to appear in "New Directions for Evaluation." It articulated an approach in which methods for studying causation depend, in large part, on what is known about the theory underlying the program. Lipsey discussed the benefits…

A representative sample of studies drawn from the published program evaluation literature is examined. It is concluded that weak designs, low statistical power, ad hoc measurement, and neglect of treatment implementation and program theory characterize the state of the art in program evaluation. (Author/BS)