Houston Independent School District (HISD) strives to provide an equitable education to all its students. To uphold the district's mission, the Teacher Appraisal and Development System (TADS) was designed with the goal of promoting effective teaching by providing systematic, rigorous feedback on teacher effectiveness in the classroom. Through the use of comprehensive rubrics and student growth measures, the TADS is intended to give teachers and school leaders the information they need to improve teacher performance in the classroom, supporting efforts to ensure that every student in the district receives the opportunity to learn from an effective teacher. The purpose of this report is to provide aggregate data of the TADS in 2017-2018. The criteria used for the instructional practice (IP) and professional expectations (PR) components have remained the same since the inception of the TADS in the 2011-2012 school year. Student performance (SP) was added for the 2012-2013 school year, was waived for most teachers for the 2016-2017 school year, and was waived for all teachers in 2017-2018. As such, the SP component is not described in this report. Instead, the focus is on the distribution of summative ratings and the instructional practice and professional expectations components of the TADS. Data are disaggregated by teacher-level and campus-level characteristics to examine how teachers with these ratings were distributed throughout the district.