Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Reach Envelope(also: Workspace Envelope, Reach Zone, Comfort Zone)
- The three-dimensional volume of space that a person can physically access with their hands or arms from a given position, taking into account their specific motor abilities, range of motion, and comfort levels. For people with upper extremity mobility impairments — such as those…
- Repetitive Stress Injury(also: RSI, Repetitive Strain Injury, Repetitive Motion Injury)
- A group of conditions caused by repetitive movements, forceful exertions, or sustained awkward postures over extended periods, resulting in damage to muscles, tendons, nerves, or other soft tissues. In computing contexts, RSI commonly affects the hands, wrists, arms, shoulders,…
- Rigidity(also: Muscle Rigidity, Stiffness)
- Increased muscle tone causing stiffness and resistance to passive movement, commonly experienced in Parkinson's Disease and other neurological conditions. Unlike spasticity (which varies with movement speed), rigidity is constant throughout the range of motion. Rigidity affects…
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