This book aims to provide a comprehensive history and analysis of the operation and evolution of Project Head Start. The volume consists of 23 original articles covering program history, the preschool education and developmental components of Head Start, and Head Start program development and evaluation. In Part One, the historical roots of Head Start, the intellectual and political climate of the 1960s, leadership within the Johnson Administration and the role of early planners and administrators are discussed. An overview of the program's first decade in operation is provided. Philosophy, implementation, curriculum models and educational assessment of preschool education within Head Start are explored in Part Two. Part Three focuses on health, mental health and social services as part of a comprehensive developmental program. Additionally, the social context of parent involvement and career development are delineated. In Part Four, special field projects among American Indians, Puerto Ricans and residents of the Trust Territory are briefly discussed as well as program development and administration. Part Five describes and presents findings of project evaluations. Parent perspectives on the program are also presented. Finally, project theory and practice are critiqued and problems of program evaluation are indicated. A bibliography consisting of materials on Head Start published between 1965 and 1975 is included. (Author/RH)