Dr Joanne Gallagher Specialist Clinical Psychologist Belfast
Trust
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3 requirements: 1. Significant impairment in intellectual
functioning (IQ). This means the person has great difficulty with
their thinking skills.
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2. Significant impairment in adaptive/social functioning. This
means that the person has difficulty with aspects of their
independence and taking care of themselves. 3. These difficulties
develop during the developmental period (i.e. First 18 years of
life)