School Performance Plan
ATSI refers to a designation given to schools under Nevada's federally-approved Every Student Succeeds Act (ESSA) Plan. ATSI schools have very low-performing student subgroups that, if those subgroups' performance were considered on their own, would lead to a Comprehensive Support and Improvement (CSI) designation.
In short, these are schools identified as needing improvement due to the consistently low performance of specific student groups.