User Participation

The active involvement of end users in the design, development, and evaluation of products, services, or systems that affect them. In accessibility contexts, user participation means including people with disabilities not just as test subjects but as collaborators who contribute expertise about their own needs and experiences. Effective user participation requires methods adapted to participants' abilities—people with cognitive disabilities may need visual tools and repeated sessions, while people with motor impairments may need alternative input methods. The principle "nothing about us without us" emphasizes that decisions affecting disabled people should involve their participation to ensure relevance and avoid discrimination.