The Building and Sustaining the Child Care and Early Education Workforce project aims to increase knowledge and understanding about child care and early education (CCEE) by documenting factors that drive turnover and by building evidence on current initiatives to bolster a qualified CCEE workforce. As part of the project, researchers identified a need for more and better data on which individuals enter, advance in, stay in, and exit different roles, settings, and types of CCEE care or leave the field altogether—as well as when, how, and why they do. This information is important for informing the development, evaluation, and improvement of strategies that effectively build and sustain a qualified and stable CCEE workforce. For this reason, the BASE project team conducted a data scan to summarize the landscape of existing data sources that may address these gaps and identify areas where future data collection may be most useful. (author abstract)