Glossary

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Pelli-Robson Chart(also: Pelli-Robson Contrast Sensitivity Chart)

The Pelli-Robson chart is a clinical tool used to measure contrast sensitivity — the ability to detect objects at low-to-moderate contrast levels. The chart consists of a series of letter-charts composed of different contrasts, mapping a contrast-sensitivity function for the…

Person-Technology Match(also: PTM, Matching Person and Technology)

A systematic approach to selecting assistive technology by evaluating the fit between a person's specific abilities, needs, preferences, and environment and the features and demands of available technologies. The person-technology match process recognizes that the most…

Personality Test(also: Personality Inventory, Personality Assessment)

A psychometric instrument that attempts to quantify traits such as conscientiousness, extraversion, emotional stability, or risk tolerance. Personality tests were introduced in industry during and after World War I to screen for "maladjusted" workers, and are now the most…

Pointing Task(also: Target Acquisition Task, Fitts' Task)

A fundamental human-computer interaction task in which users move a cursor (via mouse, touchpad, finger, or other input device) to click or tap on a target. Pointing tasks are governed by Fitts' Law, which predicts that movement time increases with distance to the target and…

Practice Effects(also: Test-Retest Practice Effects, Familiarity Effects)

Practice effects in cognitive assessment refer to the improvement in test scores that occurs not from genuine cognitive change but from increased familiarity with test content and format across repeated administrations. They are a significant limitation of fixed-content…

Process Model of Emotion Regulation(also: Gross Process Model)

A theoretical framework developed by James Gross that conceptualizes emotion regulation as a dynamic, continuous process with four main stages: identification (recognizing an emotion that needs regulation), selection (choosing a regulation strategy such as situation selection,…

Psychometric Test(also: Psychometric Assessment, Psychometric Evaluation)

A standardised measurement instrument designed to assess an individual's cognitive abilities, motor skills, perceptual speed, or other psychological attributes. In accessibility research and usability evaluation, psychometric tests such as the Mini-Mental State Examination…

Psychosocial Impact of Assistive Devices Scale(also: PIADS)

A 26-item self-report questionnaire designed to measure the psychosocial impact of an assistive technology device on a person's functional independence, well-being, and quality of life. PIADS assesses three subscales: competence (subjective feelings of competence, productivity,…

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