This report describes the development, introduction, and evaluation of the SuperStart comprehensive prekindergarten program adopted by the New York City Public Schools in 1990. By 1991, SuperStart offered 299 classes in 188 schools, providing a developmentally appropriate learning environment to foster cognitive, social, emotional, and physical development in 4- and 5-year-olds from disadvantaged backgrounds. Part 1 of this report introduces the SuperStart program, while parts 2 and 3 discuss and evaluate the program's implementation at the macro- and micro-levels. Part 4 examines and evaluates the effectiveness of parent involvement and family services provided by SuperStart. Part 5 discusses student outcomes and the program's overall strengths and weaknesses, and part 6 makes specific recommendations to improve the effectiveness of SuperStart. Two appendices provide copies of student application and developmental profile forms. (MDM)