قارن الطرق

	Realist Evaluation	Contribution Analysis
المجال	Public Policy	Public Policy
العائلة	Process / pipeline	Process / pipeline
سنة النشأة	1997	2001
صاحب الطريقة	Ray Pawson & Nick Tilley	John Mayne
النوع	Theory-driven, generative evaluation approach	Theory-based approach to causal inference about contribution
المصدر التأسيسي	Pawson, R., & Tilley, N. (1997). Realistic Evaluation. London: SAGE Publications. ISBN: 9780761950097	Mayne, J. (2012). Contribution analysis: Coming of age? Evaluation, 18(3), 270–280.
الأسماء البديلة	Realistic Evaluation, Theory-Driven Realist Evaluation, CMO Configuration Analysis, Pawson-Tilley Evaluation	Mayne's Contribution Analysis, Contribution Story Analysis, Theory-Based Contribution Analysis
ذات صلة	4	3
الملخص	Realist evaluation is a theory-driven approach to evaluating programs and policies that asks not simply 'does it work?' but 'what works, for whom, in what circumstances, and why?'. Developed by Ray Pawson and Nick Tilley in their 1997 book Realistic Evaluation, it treats interventions as theories incarnate: programs offer resources or opportunities that trigger underlying mechanisms of reasoning and response in participants, and those mechanisms only fire in particular contexts. The unit of analysis is the Context-Mechanism-Outcome (CMO) configuration, and the goal is to build and refine middle-range theory that explains differential outcomes across settings.	Contribution analysis is a theory-based evaluation approach that addresses the attribution problem — establishing whether and how an intervention made a difference — without relying on an experimental counterfactual. Developed by John Mayne from 2001 onward, it works by articulating the program's theory of change, gathering evidence along that chain, and then assembling a 'contribution story' that is progressively stress-tested against rival explanations. The aim is not statistical attribution but a credible, evidence-based conclusion that the program plausibly contributed to observed results, in the face of other influencing factors.