Regressions that control for confounding factors are the workhorse of evaluation research. When treatment effects are heterogeneous, however, the workhorse regression leads to estimated treatment effects that lack behavioral interpretations even when the selection on observables assumption holds. Regressions that use propensity scores as weights…

Evaluators usually have preconceptions about how decisions are made in social programs and how evaluation results will be used. This article demonstrates how an evaluator's choice of a decision-making model has significant impact on the conduct and fate of the research. (Author/CM)

The validity of vignettes used to elicit subject responses in social science research is examined in a study of the validity of a group of patient assault vignettes seen by 12 persons with experience in patient care. A model for establishing the validity of vignettes is proposed. (SLD)

A sample of 459 American Evaluation Association members was surveyed about ethical challenges they encountered in evaluation work. Respondents report a wide variety of ethical conflicts, with evaluators frequently pressured to compromise their roles as scientists and the evaluation product. A framework is proposed for interpreting these findings.…

Three exploratory studies involving 116 students examined the relevance of a developmental model for approaching supervision of graduate students in evaluation studies. The model includes three stages and eight developmental tasks in each stage. Three case studies support using the developmental model in conceptualizing student progress. (SLD)