Ability Assumptions

Ability assumptions are the implicit expectations that technology designers build into systems about users' physical, sensory, and cognitive capabilities. These assumptions — about how fast someone moves, their range of motion, body proportions, grip strength, speech patterns, or physical consistency — are embedded in sensing systems, user interfaces, and interaction designs. When these assumptions do not match the actual abilities of users with disabilities, technologies become inaccessible or unusable. Ability assumptions are particularly problematic in ubiquitous computing and IoT environments where sensors and automated systems make decisions based on expected physical behaviors.