Law (2016) indicates that today many funders now request or encourage rigorous conservation evaluation as a condition of funding, and conceptual and technical how-to literature is increasingly available (Ferraro 2012, World Bank Group 2013, Fisher et al. There is also an expanding drive and capacity to collate the required data (Ferraro and Pressey 2015, Bare et al. The lack of studies using rigorous impact evaluation methodologies may be partly explained by the fact that their use was not planned for in the design of the policy, meaning there is no counterfactual to measure against. From Development Cooperation to National Policies, German Institute for Development Evaluation (DEval), Bonn.