Impact evaluation is a key part of evidence-based policy making, which focuses on outcomes and results rather than inputs. It helps determine whether programs achieve their intended goals and provides credible evidence on their effectiveness. Impact evaluations assess the changes in individuals' well-being that can be attributed to a program, policy, or project. They are essential for understanding the causal relationship between a program and its outcomes. Impact evaluations can be prospective or retrospective, and they can be used to test the effectiveness of a program or to evaluate the impact of a policy. They are also used to test alternative program designs or innovations in service delivery. Impact evaluations are important for informing policy decisions, shaping public opinion, and improving program operations. The book provides an overview of impact evaluation, including its importance in evidence-based policy making, the different types of impact evaluations, and the methods used to conduct them. It also discusses the role of impact evaluations in policy discussions and how they can be used to test alternative program designs or innovations in service delivery. The book includes case studies and examples to illustrate the application of impact evaluations in real-world situations.Impact evaluation is a key part of evidence-based policy making, which focuses on outcomes and results rather than inputs. It helps determine whether programs achieve their intended goals and provides credible evidence on their effectiveness. Impact evaluations assess the changes in individuals' well-being that can be attributed to a program, policy, or project. They are essential for understanding the causal relationship between a program and its outcomes. Impact evaluations can be prospective or retrospective, and they can be used to test the effectiveness of a program or to evaluate the impact of a policy. They are also used to test alternative program designs or innovations in service delivery. Impact evaluations are important for informing policy decisions, shaping public opinion, and improving program operations. The book provides an overview of impact evaluation, including its importance in evidence-based policy making, the different types of impact evaluations, and the methods used to conduct them. It also discusses the role of impact evaluations in policy discussions and how they can be used to test alternative program designs or innovations in service delivery. The book includes case studies and examples to illustrate the application of impact evaluations in real-world situations.