The study, "Maximizing Student Agency: Implementing and Measuring Student-Centered Learning Practices," aims to identify the instructional practices that may be useful for the development of different aspects of student agency (i.e., self-efficacy, self-regulated learning, and persistence) and determine whether these instructional practices are equally helpful for different subgroups of students. In collaboration with four New Tech Network (NTN) high schools, the American Institutes for Research (AIR) used a mixed-methods approach consisting of teacher and student surveys and focus groups as well as facilitation of a networked improvement community (NIC) to address several research questions. The team at AIR worked alongside fellow scholars, educators, and policymakers to investigate the impact of specific student-centered practices and then translate their findings for cross-sector audiences. This report represents their work over the past two years as they designed, tested, and revised teacher practices as part of a networked improvement community and examined how student agency impacted academic outcomes. This technical appendix provides additional information about the study, including a description of the study sample, survey administration procedures, survey response rates, statistical analyses used to address research questions, and detailed study findings. A full accounting of results pertaining to the study's research questions can be found in the final report. [American Institutes for Research (AIR) conducted this study as part of Jobs for the Future's (JFF) Student-Centered Learning Research Collaborative. For the final report, see ED592084.]