From the Document: "Both the executive branch and congressional committees need evaluative information to help them make decisions about the programs they oversee-information that tells them whether and why a program is working well or not. The Government Performance and Results Act of 1993 (GPRA) and GPRA Modernization Act of 2010 (GPRAMA) established a framework for performance management and accountability within the federal government. Building on that foundation, Congress has since passed, among other laws, the Foundations for Evidence-Based Policymaking Act of 2018 (Evidence Act) to strengthen the evidence-building efforts of executive branch agencies. The Evidence Act, for example, created a framework for a more comprehensive and integrated approach to federal evidence-building efforts. This product updates our previous glossary (GAO-11-646SP) to highlight different types of evaluations for answering questions about program performance, as well as relevant issues to ensure study quality."
Government Accountability Office: https://www.gao.gov/