DEFINITION: Often called an outcome or impact evaluation, is conducted at the end of an intervention or on a mature intervention to determine the extent to which anticipated results were realized. Summative evaluation is intended to provide information about the worth and impact of the program. Summative evaluations include impact evaluations, costeff ectiveness investigations, quasi-experiments, randomized experiments, and case studies.
SOURCE: Morra-Imas, Linda G. and Rist, Ray, C.(2009). The road to results : designing and conducting eff ective development evaluations.The International Bank for Reconstruction and Development / The World Bank, USA.