The purpose of this technical appendix is to share detailed results and to more fully describe the sample and methods used in the research included in the brief, "Recovery Still Elusive: 2023-24 Student Achievement Highlights Persistent Achievement Gaps and a Long Road Ahead." The authors investigated three main research questions in this brief: 1) How does growth in the 2023-24 school year compare to a typical school year? 2) How did achievement gaps change in the 2023-24 school year and how much additional schooling will be required to close these gaps? 3) How do these patterns differ by race/ethnicity and school poverty? Additionally, they included a supplemental analysis that looked at trends by grade level from spring 2017 to spring 2024. Since this analysis involved a separate dataset from the three main research questions, they describe the data and methods for this analysis separately at the end.