Definition of disability clarifies autism, cerebral palsy, mental retardation, multiple and severe disabilities for welfare access. Definitions set the statutory eligibility criteria: autism as uneven communicative and social skill development with repetitive behaviour; cerebral palsy as non progressive motor control and posture disorders from early brain insult; mental retardation as arrested mental development with sub normal intelligence; multiple disabilities as combinations of two or more listed disabilities; person with disability to include sufferers of these conditions or severe multiple disability; and severe disability as eighty percent or more of one or more multiple disabilities.