The RAND Corporation is conducting a multiphase evaluation of the initiative, including an implementation study of the four pillars that underlie Big Lift--The Big Lift Implementation Study: Final Report (Faxon-Mills et al., 2018)--and a series of annual descriptive analyses focused on the outcomes of children who received Big Lift services. The three reports--Big Lift Participation and School Entry Indicators: Findings for the 2016-2017 Kindergarten Class (Gomez, Cannon, and Whitaker, 2017), The Big Lift Descriptive Analyses: Kindergarten Readiness and Elementary School Reading Outcomes for the 2016-2017 and 2017-2018 Kindergarten Classes, and The Big Lift Descriptive Analyses: Progress Across Three Kindergarten Classes--focused on the early education and summer learning experiences of the 2016-2017, 2017-2018, and 2018-2019 kindergarten classes. In the third report, we also focused on pooling data across kindergarten classes to understand how Big Lift children compare with their peers among all children eligible for services to date. This Technical Appendix accompanies the third report in this series of outcome studies. (author abstract)