This is the technical appendix for the report "Gaining Momentum: Refining Corequisite Learning Support to Boost Student Success in the First Year and Beyond" which seeks to develop a body of actionable information about how to refine learning support, close equity gaps, and promote strong momentum toward success for community college students in their first year of enrollment and beyond. This appendix includes the following sections: (1) About the Data; and (2) About the Data Analysis.