This workbook is a companion to Mental Health Approaches to Intellectual/Developmental Disability: A Resource for Trainers and is designed to be given to all trainees. The Trainee Workbook contains copies of all slides that will be used in your training, but does not include text explaining the slides. The Trainee Workbook does include space for you to record your own notes about the material. Each training module includes a pre-test to be taken prior to the training and a post-test to be taken after the training. The Resource for Trainers and the Trainee Workbook provide training concerning the field of support for persons with intellectual or developmental disabilities (IDD) and mental health concerns. The material is arranged in ten modules. It is unlikely that a single training session would attempt to cover all modules. Module I: What Is a Dual Diagnosis? Module II: Building on the Basics: Understanding Assessment Practices in Dual Diagnosis Module III: Mental Health Evaluations Module IV: Signs and Symptoms of Mental Illness Module V: From DM-ID to DM-ID-2 Module VI: Support Strategies Module VII: Adapting Therapy for People with IDD Module VIII: Childhood and Adolescence Module IX: Aging Module X: Inter-Systems Collaboration