During its seven year history, "Sesame Street" has maintained high popularity while introducing such innovations as new cognitive curricula, new characters, bilingual elements, and affective and social education. Early goals emphasized 40 predominantly cognitive objectives aimed at helping the disadvantaged child. Additions have included location-based programs, specially designed segments for the mentally retarded, the Muppets, original music, and guest stars. Both formative and summative research have been conducted. Though attracting an audience was initially a problem, the program now has an extensive global audience. A chart of curriculum innovations is included. (EMH)