The guideline was revised with the aim of providing an overview for government staff undertaking and managing evaluations. The guideline is broad and can be applied in different contexts. It provides the definition of impact evaluation as adopted by the Department of Planning, Monitoring and Evaluation (DPME), conceptual clarification of the term impact evaluation acknowledging various connotation of the term, its purpose, how to decide whether or not an impact evaluation is required, key elements of designing an impact evaluation, typical impact evaluation questions, methodological approaches to answering policy relevant questions, as well as analytical methods for use in impact evaluations.