The purpose of this technical appendix is to share more detailed results and to describe more fully the sample and methods used in the research included in the brief, "Progress toward Pandemic Recovery: Continued Signs of Rebounding Achievement at the Start of the 2022-23 School Year" (ED627355). The two main research questions investigated in this brief are: (1) How do summer learning patterns in summer 2022 compare to a pre-pandemic summer? and (2) Do researchers continue to see signs of test scores rebounding at the start of the 2022-23 school year? The data for this study are from the NWEA anonymized longitudinal student achievement database.