Trainee Workbook for Mental Health Approaches to Intellectual/Developmental Disability is the companion tool to be used alongside Mental Health Approaches to Intellectual/Developmental Disability: A Resource for Trainers. Together, the books empower support professionals, social workers, clinicians, counselors, and other professionals to provide high-quality, person-centered care to individuals with intellectual or developmental disabilities (IDD) and mental health concerns. This updated, expanded Second Edition breaks down complex issues including assessment practices, positive support strategies, crisis prevention, adaptive therapy, trauma-informed support, justice system considerations, collaboration across systems, and more. The workbook includes all the slides used in the training, as well as pre- and post-tests and supplemental material so professionals can deepen their knowledge and expand their expertise.