In 2013, the Institute of Medicine’s (IOM) Global Forum on Innovation in Health Professional Education held two workshops on IPE. At these workshops, a number of questions were raised, the most important of which was “What data and metrics are needed to evaluate the impact of IPE on individual, population, and system outcomes?” To answer this question, the Forum’s 47 individual sponsors requested that an IOM consensus committee be convened to examine the existing evidence on this complex issue and consider the potential design of future studies that could expand this evidence base.