Disability-Affirmative Therapy: A Case Formulation Template for Clients with Disabilities - Paperbackby Rhoda Olkin (Author) Clinicians outside of rehabilitation psychology do not receive training on how to work with clients with disabilities. Nonetheless, given that people with disabilities comprise over 15% of the population, virtually all clinicians will have clients with disabilities in their practice. Without education or training in disability, clinicians are prone to make errors in estimating the role of disability in the presenting problems