The findings are presented of a consensus group created to address the standardization of performance measures for emergency medicine. This group, whose members have affiliations with most major organizations interested in emergency medicine performance, benchmarking and quality improvement, was tasked with standardizing definitions pertinent to emergency department performance measures, creating a set of general and operational measures, developing a comparison system for benchmarking and creating a plan for the dissemination of this information. The formation of this group, the problem statement, and the mission statement for the summit are all described, and the consensus document is presented.