State and territory child care and early education (CCEE) leaders typically support a range of professional development (PD) opportunities for CCEE providers. This highlight presents the "Professional Development Matrix for Quality Improvement" created by Douglass, Tout, and Doyle. The matrix provides a framework for organizing and describing PD that can support CCEE leaders' decisions about what to fund and how to support evaluation of PD efforts. The highlight also provides examples and summarizes research evidence for each type of PD in the matrix. [This report was produced collaboratively with the Culture of Continuous Learning Project and the Research Translation team of the Child Care and Early Education Research and Policy Analysis (CCEEPRA) project.]