This Dual Diagnosis online course is a non-credit program comprised of the first three chapters of Dual Diagnosis: An introduction to the mental health needs of persons with developmental disabilities, published in 2002 by the National Association for the Dually Diagnosed (NADD Ontario). Course module topics include a basic introduction to the nature of developmental disabilities, recognizing and understanding the mental health needs of persons with developmental disabilities within a biopsychosocial model, and implications and strategies for optimizing supports.

The course comprises three modules with self-assessment quizzes and application exercises. A multiple choice final exam follows. Learners have one month, from date of purchase, to complete the course.



“The subject matter applied to the work I do in a very direct way; good examples to draw upon.”

“I liked the flexibility to access and complete at my own pace where and when I had the quiet time to do it.”

College Program, Director

“We found the course to be invaluable as a learning tool for dual diagnosis. It allows students to get a better grasp of what it is and what kind of supports are necessary to work with individuals with complex needs. As many of our graduates will be working in the field and supporting individuals with dual diagnosis, it is a great primer and a comprehensive look at the topic.”

John Kosmopoulos, M.A., BCBA
Coordinator/ Professor
Behaviour Science (ABA) Program
School of Social & Community Services
Humber College, Ontario