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Glossary

Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.

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Peak Velocity
The maximum speed reached by a cursor or limb during a directed movement toward a target. In human-computer interaction research, peak velocity is a key metric for understanding pointing performance, typically occurring in the first quarter of a movement. Peak velocity decreases…
Playtesting(also: Play testing)
A user-research method in game and interactive-system design in which representative users play an in-development game while researchers observe, collect think-aloud commentary, and conduct follow-up interviews to probe mechanics, engagement, difficulty, and fit with intended…
Pluralistic Walkthrough(also: Pluralistic Usability Walkthrough)
A group usability inspection method, introduced by Randolph Bias in 1994, in which users, developers, and usability specialists step through a task scenario together, each writing down the actions they would take at every screen before discussing as a group. It extends the…

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