Glossary

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ABA Reversal Method(also: ABA Design, Reversal Design)

The ABA reversal method is a single-subject experimental design in which one participant is observed across three phases: a baseline (A), an intervention (B), and a return to baseline (A). By comparing performance across the A-B-A sequence, the design isolates the effect of the…

ABC Model(also: Antecedent-Behavior-Consequence, ABC Analysis, ABC Framework)

A behavioural-science framework, rooted in B. F. Skinner's operant conditioning, that analyses any observed behaviour as a three-part sequence: Antecedent (the situation, trigger, or context immediately before the behaviour), Behaviour (what the person actually did), and…

Abandonment of Assistive Technology(also: Assistive Technology Abandonment, AT Abandonment, Assistive Technology Discontinuance)

Abandonment of assistive technology is the well-documented phenomenon in which a substantial proportion of assistive devices acquired by disabled users — commonly reported in the literature at roughly one-third or higher — end up unused or discarded within a few years of…

Active Perception(also: Active Sensing, Sensorimotor Exploration)

A view of perception in which the perceiver is not a passive receiver of stimuli but an active agent who moves, orients, and manipulates the environment to gather the sensory information needed for a task. In accessibility and sensory substitution research, active perception is…

Ambiguous Loss

Ambiguous loss, a concept articulated by Pauline Boss, is 'a situation of unclear loss that remains unverified and thus without resolution'. Boss distinguishes two types: physical loss where someone is 'gone, but not for sure' (for example, a missing person) and psychological…

Ask-Point(also: Help Request Point)

Ask-point is a term introduced in disability-and-HCI research to name a discrete moment in daily life at which a person with a disability must request help from a caregiver, family member, or other person — for example, reaching for a dropped object, opening a door, transferring…

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