Validity in Evaluation Research: a critical assessment of current issues
Various quasi-experiments have been considered inferior to randomized experiments in internal validity by Campbell and Stanley. However, due to later developments of sophisticated methods as ARIMA models and modelling selection bias, the gap between randomized experiments and quasi-experiments in dealing with internal validity has narrowed. Furthermore, quasi-experiments also have other advantages such as unobtrusiveness and greater applicability to the evaluation of human services programs.
Current approaches to validity tend to be a single-validity oriented approach; that is, they tend to achieve one type of validity at the expense of others. I propose a theory-driven approach that attempts to provide a more balanced view. The emphasis of this approach is to stress the incorporation of formal models or theory into program evaluation, thereby articulating clearly the identified potential threats to validity in a research. The theory-driven approach can and should deal with internal, external, construct, and statistical conclusion validity simultaneously.
Document Type: Research Article
Publication date: January 1988
An International Journal
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