Motor Accessibility

Motor accessibility refers to the design of digital systems and interfaces to be operable by people with physical disabilities affecting movement, strength, coordination, or fine motor control. Relevant conditions include cerebral palsy, muscular dystrophy, spinal cord injury, repetitive strain injury, Parkinson's disease, multiple sclerosis, stroke, and limb differences. Accessible design for motor impairments involves minimizing required precision (large click targets, tolerance for input errors), reducing the number and complexity of required actions, supporting single-switch or sequential access, eliminating simultaneous key combinations, and ensuring compatibility with assistive input devices such as head pointers, eye gaze systems, sip-and-puff devices, and adapted keyboards. WCAG 2.1 addresses motor accessibility primarily through Guideline 2.1 (Keyboard Accessible), Guideline 2.5 (Input Modalities), and related success criteria.