Theory Based Approach
An important insight from theory-based evaluations is that policy interventions are (often) believed to address and trigger certain social and behavioral responses among people and organizations while in reality this may not necessarily be the case. Theories linking interventions to outcomes should be carefully articulated. What are the causal pathways linking intervention outputs to processes of change and impact?
Leeuw, Frans & Vaessen, Jos (2009): Impact Evaluations and Development. Nonie Guidance on Impact Evaluation. Draft Version for Discussion at the Cairo conference March-April, 2009. Nonie – Network on Impact Evaluation, p. 20-25.