In 1974. the reauthorization of Head Start established the comprehensive Program Performance Standards to guide Head Start centers in providing essential educational. health. and social services. and achieving parental involvement. The reauthorization also paved the way for a network of training and technical assistance activities to help Head Start agencies enhance the quality of their programs. In the 1980s and early 1990s. the Indian and Migrant Head Start programs were formed. and family service centers were established to combat illiteracy. substance abuse. and unemployment in Head Start communities. At that time. Head Start also began its important focus on improving transitions for preschool children to public schools.