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…

It is argued that, although thousands of evaluations have been conducted of social interventions, little has been done to cumulate those results to guide intervention architects. Building social intervention theory and meta analyses are suggested as ways to unify this knowledge and make it useful. (SLD)