Quality control in the auditing profession has developed useful practices that are applied to the research and evaluation process. By identifying and controlling sources of bias and noise in the system of inquiry, the quality of evaluative evidence can be enhanced for both present and future use. (Author/BS)

Information that describes a program's implementation and client audience can help the evaluator tailor the study to the constraints of particular settings and increase the likelihood that the evaluation can be implemented as planned. (Author/BS)

There are numerous micro-level methods decisions associated with planning an impact evaluation. Quantitative synthesis methods can be used to construct an actuarial data base for establishing the likelihood of achieving desired sample sizes, statistical power, and measurement characteristics. (Author/BS)

The manner in which results and methods are reported influences the ability of the synthesis of prior studies for planning new evaluations. Confidence ratings, coding conventions, and supplemental evidence can partially overcome the difficulties. Planners must acknowledge the influence of their own judgement in using prior research. (Author)

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)