The estimation of the "size of effect" of educational programs is a difficult problem in program evaluation. It is argued that the intentions of the program and the nature of the measures must be known in order to estimate program effects. (JKS)

When participants with varied background and interests join in a collaborative activity, their different viewpoints may make the evaluation of the activity more difficult. Experience evaluating a multidisciplinary biomedical research center illustrates the influence of values on program evaluation. (Author/GDC)

Distortion and selective disclosure limit data that are available to program evaluators, producing a bias that tends to maintain the status quo. Paradoxically, attempts to objectify the data only increase the potential for distortion. Ironically, one way to encourage innovation may be to not measure it. Additional solutions are suggested.…

Evaluations of special education interventions are different from research on medical interventions. Educational evaluations would be more useful if they applied an actuarial, or probability approach. Information should be collected over time and using various measures, thus increasing the available data. (GDC)

This paper reports the problems involved in measuring the extent to which the practice in program sites matches model theory formulated in Head Start Planned Variation. The main focus in studying program implementation is the question of internal validity, whether the children in the HSPV programs actually receive the treatment being evaluated.…

Because research synthesis enables one to determine either the overall effectiveness of a particular treatment or the relative effectiveness of different types of treatments, it is becoming increasingly popular as a tool in program evaluation. Numerous methodological problems arise, however, when research synthesis is applied to studies conducted…

A model for research and evaluation in outdoor education is presented in this paper which includes a bibliography of representative research in outdoor, experiential education. The model stresses close interaction between program designers and evaluators and rests on the premise that the strength of outdoor education--interaction between people,…