All across society people use information to make good decisions. Policymakers and elected officials must be held to the same standard and engage in evidence-based policymaking. Today, there are a great many success stories about how evidence informs policy. Evidence Works presents a collection of case studies that highlight the many approaches to using evidence, the different types of information that can be relevant, and the challenges faced in the real world. But one thing is clear—society benefits when policymakers use research evidence to make good decisions.