A theory-driven approach to evaluation (TDE) emphasizes the development and empirical testing of conceptual models to understand the processes and mechanisms through which programs achieve their intended goals. However, most reported applications of TDE are limited to large-scale experimental/quasi-experimental program evaluation designs. Very few…

The article offers a brief history of past income-maintenance programs summarizes a unique income-maintenance experiment, describes present welfare programs, and lists the unanswered questions in welfare reform. (Income maintenance for intact families at levels employed in the study would not have large effects on labor supply, concluded…

The report is a study of the utility of social reinforcement for improving Air Force training. It was conducted through a field evaluation of social incentive instructional systems which would serve to improve student motivation, classroom performance, and attitudes. The participants included a total of 300 trainees from two Air Force bases; 25…