Funded by the Office of Planning, Research, and Evaluation in the Administration for Children and Families, the purpose of this project was to develop design options for a research study of coaching that would provide for the best, efficient, and most feasible practices within the context of the Office of Head Start’s professional development system. The project established a strong theoretical framework for coaching in Head Start, determined effective methodologies for evaluating coaching in Head Start, and combined theory and practice to produce concrete design options. MEF was a member of a project team being led by AIR that also includes MDRC and Child Trends.