Mental Health Approaches to Intellectual/Developmental Disability: A Resource for Trainers is a landmark contribution to the field of support for persons with Intellectual or Developmental Disabilities (IDD) and Mental Health concerns. This book can be used by a myriad of different professionals and care providers for a variety of different purposes. It may be used: (a) to train others for professional development (train-the-trainer model), (b) as a resource guide for individual study, or (c) as a reference guide. Proper support of mental wellness among persons with IDD requires a significant body of information and knowledge, and the authors of this book are happy to offer it as a means for educating professionals and care providers. The overall mission of this book is to provide an overview of mental health assessment, treatment, and supports for persons with IDD over the lifespan. The book is arranged in modules, allowing reader or trainer to select those topics that are of interest. Mental Health Approaches to Intellectual/Developmental Disability: A Resource for Trainers is designed to be used with a wide range of audiences from direct support workers to professionals from various disciplines. To facilitate using this book to train others (train-the-trainer model), a flash drive containing PowerPoint slides and notes is included. Additionally, a companion volume, entitled Trainee Workbook for Mental Health Approaches to Intellectual/Developmental Disability is available from the NADD Press."