1. The document defines four levels of intellectual disability based on IQ scores: mild (50-55 to approx. 70), moderate (35-40 to 50-55), severe (20-25 to 35-40), and profound (below 20-25).
2. Adaptive behaviors are defined in nine areas: communication, self-care, home living, social/interpersonal skills, use of community resources, self-direction, functional academic skills, work, and leisure. Deficits in these areas are used to diagnose intellectual disability.
3. Treatment and support strategies are outlined, including early intervention, physical/occupational therapy, education programs, life skills training, and community inclusion programs.