The U.S. Department of Health and Human Services (DHHS), Office of Policy Research and Evaluation (OPRE) provided grant funding to researchers at Education Development Center, Inc. (EDC) to conduct a rigorous investigation of the impact of one type of partnership -- formal arrangements between child care providers, which primarily provide support for families' workforce participation, and Head Start programs, which focus on children's early development. This research builds on existing research findings that partnerships between child care and Head Start are associated with improved benefits at the program level. Our study examines whether partnerships yield benefits for family child care providers, examines quality at the classroom level, and explores the relationship between partnership and children's school readiness. This report represents the findings from our study of partnerships called the Child Care Quality Project (Grant Number 90YE0077). (author abstract)