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This is the second blog in our series ‘Lessons on using Contribution Analysis for impact evaluation’. In our first blog, we introduced Contribution Analysis (CA) as an overarching approach to theory-based evaluation and the idea of causal hotpots as a way to zoom in, unpack and make the hard choices of where to focus evaluation research. Identifying specific links in the theory of change (ToC) with specific evaluation questions enables you to then choose appropriate methods. We have applied the approach in diverse settings, testing how robust Contribution Analysis can really be. Here we walk you through an example.