Programs that provide diagnostic, treatment and habilitative services for adults with developmental disabilities. The programs may be available on a full or part day basis; focus on self-care, socialization, communication, independent living, functional academics and prevocational skills to maximize independence; and include speech and language therapy, physical therapy, occupational therapy, nutritional services, psychological services and other clinical services as needed.

Community-based programs that provide long-term personal and social development opportunities within a structured environment for individuals with developmental disabilities who are unable to function independently in social, recreational or employment settings. Services are available on an hourly or daily basis and may include daily living skills instruction, basic education, recreational and social activities, exercises to improve coordination and other forms of developmental support which help participants develop and maintain the functional skills that are required for community involvement, self-advocacy, self-care and employment, if possible.

Programs that find paid, meaningful work in a variety of community-based settings for people who have disabilities and which assign a "job coach" to work side-by-side with each client to interface with the employer and other employees, and provide training in basic job skills and work-related behaviors, assistance with specific tasks as needed and whatever other initial or ongoing support is required to ensure that the individual retains competitive employment. Included are individual placement models in which a job coach works on-the-job with a single individual and group models such as enclaves (which are self-contained work units of people needing support) and mobile work crews, in which a group of workers with disabilities receives continuous support and supervision from supported employment personnel. In the enclave model, groups of people with disabilities are trained to work as a team alongside employees in the host business supported by a specially trained on-site supervisor, who may work either for the host company or the placement agency. A variation of the enclave approach is called the "dispersed enclave" and is used in service industries (e.g., restaurants and hotels). Each person works on a separate job, and the group is dispersed throughout the company. In the mobile work crew model, a small team of people with disabilities works as a self-contained business and undertakes contract work such as landscaping and gardening projects. The crew works at various locations in a variety of settings within the community under the supervision of a job coach.

Individuals who are age 18 and older but who are not yet considered older adults.

A severe, chronic disability that is attributable to a cognitive, neurological or physical impairment or a combination of cognitive, neurological and physical impairments; that is manifested during the developmental period (prior to age 22); that is likely to continue indefinitely; and that results in substantial functional limitations in three or more areas of major life activity including self-care, receptive and expressive language, learning, mobility, self-direction, capacity for independent living, and economic self-sufficiency.