The School Improvement Division of the Texas Education Agency (TEA) identifies, monitors, and supports low-performing schools. To identify low-performing schools, TEA assigns annual academic accountability ratings to its districts and schools, but these ratings are provided only once per year and are vulnerable to disruptions in the assessment system. TEA partnered with Regional Educational Laboratory Southwest to explore whether information regularly collected by districts and schools could be the basis for creating indicators to monitor low-performing schools. The study team used a combination of student- and teacher-level administrative data made available to the study team through the Texas Education Research Center at the University of Texas at Austin and publicly available school- and district-level data available from the TEA website (including data on student characteristics, attendance aggregated to the school level, and school accountability ratings) and the Common Core of Data (National Center for Education Statistics, n.d.). The study team used data from the information management system to construct school-level measures that are not available through public accountability reporting systems, such as attendance rates, disciplinary actions, student course enrollment and completion, and teacher turnover. This document presents the following three appendixes that accompany the study: (1) Data and methods; (2) Supporting tables; and (3) Supplemental analyses. [For the full report, see ED624271.]