This document presents case studies of children from five preschools of Head Start's Planned Variation Program. The case studies are designed to reflect the meaning of the preschool experience for each individual child, with emphasis on changes in self concept, concepts of the world, interpersonal interactions, and task-oriented behavior. Children were chosen as subjects through teachers' and Head Start Directors' recommendations. The studies were based on information collected in direct observations in the preschool centers; interviews with parents were also utilized. In all, case studies of 20 preschoolers are included. Each study describes the child, how Head Start has been helpful, and what else the program might do for the child. (DP)