The fact sheet uses a question-and-answer format to describe key components of Public Law 99-457 (Amendments to the Education of the Handicapped Act), which authorizes a preschool program for children ages 3-5 and an early intervention program for handicapped infants and toddlers. In the area of preschool programs, topics covered include implementation requirements, provisions of the law for preschool children, and funding. Aspects of early intervention discussed include requirements for states, timelines, eligibility, types of services, and funding. Development of the Individualized Family Service Plan (IFSP), components of a state early intervention system, the role of the State Interagency Coordinating Council, and procedural safeguards are also described. A final section addresses the role of advocacy groups in relation to implementation of the law. (JW)