The proposed study, rooted in a public service implementation science framework, aims to take initial steps towards achieving the ultimate goal of developing meaningful, sustainable, and costeffective systems for developing, supporting, and retaining a qualified ECE workforce, and thus supporting equitable access to high-quality ECE programs through QIS. By partnering with MiamiDade County’s The Children’s Trust Thrive by 5 initiative, a large, diverse county-wide QIS and The Early Learning Coalition of Miami-Dade/Monroe, the local Child Care Development Fund (CCDF) administrator, the proposed project aims to integrate, code, clean, and conduct secondary data analysis with two administrative datasets to accomplish the following study objectives: 1) understand what PD activities have been offered over the course of fifteen years to suppo rt the early childhood workforce in a county-wide QIS, the key features of those PD activities, educator choices to engage in specific activities, and how those choices relate to retention in the field, and 2) understand who has engaged with a wage supplement scholarship and how the receipt of that scholarship relates to educators’ engagement with PD activities and retention in the field. Research questions will be answered using partially nested growth models and qualitative content analysis. Findings will ultimately serve to inform research, QIS practices, and local and national policies aiming to support ECE educators and universal access to high-quality programs for young children. This project will also help build capacity in the ECE field by supporting high-quality dissertation research, student-faculty collaboration and mentorship, and active communication, collaboration, and partnership between researchers and CCDF administrators and policymakers. (author abstract)