The Index uses data from the ESO Data Collaborative, comprised of more than 2,000 agencies and departments across the country and represents 8.8 million 911 calls (out of 10.5 million total calls) between January 1,2020-December 31, 2020.

The purpose of this Index is to serve as a point of reference for EMS organizations to identify which areas are in alignment and which areas represent opportunity for improvement, more intensive local monitoring, or at least further assessment and evaluation. This quantitative approach to measuring performance gives EMS organizations
a framework to continually refine tactics, improve efficiency and outcomes, and allocate resources appropriately.