This working paper explains the methodology for measuring the extent of support that students need to thrive academically, and how to apply the resulting School Needs Index. Developed by Education Analytics and Public Impact, the index uses previous student academic performance, as well as a host of demographic and economic indicators, to yield a nuanced profile of the level of student need at a school. And while there is much work still to be done here, this index is a crucial first step to identify schools that are achieving the greatest success with highest-need students, making it possible to share their practices. On June 17 at 12 p.m. EDT, a webinar hosted by Public Impact and FutureEd will introduce the first iteration of the School Needs Index, intended to help states and school districts determine the level of student need in each school and allocate resources equitably. The webinar will feature school leaders describing efforts to serve students more equitably and effectively, part of a launch of a National Campaign for Highest-Need Students.