The authors focus on the growing international momentum for interagency or joint evaluations of humanitarian response. The Interagency Health and Nutrition Evaluation (IHE) initiative, established in 2003, is described and analyzed in this chapter. The aims of IHE are described, as are the five components in the IHE framework of analysis: outcomes, service performance, policy and planning, risks to health and nutrition, and humanitarian context. This chapter focuses on lessons learned and identifies options for institutionalizing IHEs. © Wiley Periodicals, Inc., and the American Evaluation Association.