A case study of a 3-year-old autistic child and her family is presented, following the child through a 3-year intensive intervention program with a multidisciplinary team in a day treatment program. The day treatment program plan included academic goals, language goals, parental goals, and home training goals. A major component of the program was the family's participation in a behavior-based developmental model training course. The document presents the child's developmental history, school history, and early intervention strategies. A follow-up study 5 years after leaving the day treatment program found that the child had made apparent cognitive and behavioral improvements. Her language skills remained weak and her eye contact limited, and she exhibited little spontaneity. Her parents retained and used the skills learned from their earlier participation in the parent training course. Family counseling was recommended to aid in meeting the challenge of parenting an adolescent and to establish long-term educational and vocational goals. Seven references. (JDD)