Elections Performance IndexFrom the Pew Research Center, the Elections Performance Index, or EPI, is the first comprehensive assessment of election administration in all 50 states and the District of Columbia. Using data from 17 key indicators, the EPI makes it possible to compare election administration policy and performance across the states and from one election cycle to the next. The index presented here is based on the 2008, 2010, 2012, and 2014 elections.