Weiss, Michael J.; Bloom, Howard S.; Brock, Thomas - In: Journal of Policy Analysis and Management 33 (2014) 3, pp. 778-808
Evaluations of public programs in many fields reveal that different types of programs—or different versions of the same program—vary in their effectiveness. Moreover, a program that is effective for one group of people might not be effective for other groups, and a program that is effective...
