Individuals with intellectual disabilities are sometimes prone to complex psychiatric and behavioural challenges that require a multi-disciplinary approach. In this highly interactive workshop, presenter Dr. John C.C. Chan of the Centre for Behaviour Health Services explores a complementary relationship between psychiatry and applied behaviour analysis (ABA) through several case vignettes. Emphasis will be placed on assessing and conceptualizing clinical presentations while exploring and problem-solving these cases using biopsychosocial and behavioural strategy models. This is a highly informative and interactive talk with focus on current evidence-based, best practice perspectives for individuals with dual diagnosis.