Exploring the critical role of school choice in the future of education reform, the Education Choice and Competition Index (ECCI) is an interactive web application that scores large school districts based on thirteen categories of policy and practice relevant to choice. The intent of the ECCI is to: create public awareness of the differences among districts in their support of school choice; provide a framework for efforts to improve choice and competition; and recognize leaders among school districts in the design and implementation of choice and competition systems. The ECCI is substantially expanded for 2012, with 107 school districts versus 25 in 2011. These 107 districts include the 100 largest districts in the U.S. in terms of student enrollment plus eight additional mid-sized districts that are of interest because of their choice and competition policies. There were also adjustments in the scoring rules for 2012. The two most substantive are an increase in the requirements for the availability of choice and an increase in the proportion of total funding that must follow children to schools. [This document was written with Sarah Whitfield. For the 2011 report, see ED526966.]