New York City's Computer Science for All (CS4All) initiative, launched in 2015, aimed to provide all students across the system with at least one CS experience at each grade band (K-2, 3-5, 6-8, and 9-12). The initiative placed particular emphasis on broadening participation among girls, and Black and Latinx students, who are underrepresented in CS careers and classrooms nationwide. This report synthesizes findings from a multifaceted and wide-ranging evaluation of the initiative conducted by the Research Alliance for New York City Schools and Education Development Center between 2016 and 2024. Guided by the CAPE framework shown on page 15 (Capacity, Access, Participation, Experiences; Fletcher & Warner, 2020), the authors examined the initiative's progress using multiple data sources. The analysis offers a holistic assessment of CS4All, highlighting its successes, challenges, and implications for future CS education efforts. While this synthesis focuses on high-level, overarching insights, the authors have also produced separate, in-depth reports on specific areas, including school capacity, teacher capacity, and student outcomes. These detailed reports complement this synthesis by providing a more granular view of CS4All in each of these crucial domains. Together, they offer a comprehensive understanding of how this pioneering initiative has shaped computer science education in New York City's schools, as well as lessons for other districts implementing similar efforts.