Programs that provide opportunities for individuals with disabilities to learn and practice work skills in a separate and supported environment. Participants may be involved in the program on a transitional or ongoing basis, and are paid for their work, generally under a piecework arrangement. The nature of the work and the types of disabilities represented in the workforce vary widely by program and by the area in which the organization is located. Individuals participate in center-based employment for a variety of reasons including severity of disability, need for additional training or experience, need for a protected environment and/or lack of availability of community-based employment.