“The Magenta Book is HM Treasury guidance on evaluation for Central Government, but will also be useful for all policy makers, including in local government, charities and the voluntary sectors. It sets out the key issues to consider when designing and managing evaluations, and the presentation and interpretation of evaluation results. It describes why thinking about evaluation before and during the policy design phase can help to improve the quality of evaluation results without needing to hinder the policy process. The book is divided into two parts. Part A is designed for policy makers. It sets out what evaluation is, and what the benefits of good evaluation are. It explains in simple terms the requirements for good evaluation, and some straightforward steps that policy makers can take to make a good evaluation of their intervention more feasible. Part B is more technical, and is aimed at analysts and interested policy makers. It discusses in more detail the key steps to follow when planning and undertaking an evaluation and how to answer evaluation research questions using different evaluation research designs. It also discusses approaches to the interpretation and assimilation of evaluation evidence.”