Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Index of Difficulty(also: ID, Fitts ID)
- The Index of Difficulty (ID) is the central quantity in Fitts' law that captures how hard a rapid aimed pointing movement is, computed as log₂(A/W + 1) in the Shannon formulation, where A is the amplitude (distance to the target) and W is the target width along the movement…
- Internal Reliability(also: Internal Consistency)
- A psychometric property that measures whether all items in a questionnaire or instrument contribute consistently to the overall score. It is commonly assessed using Cronbach's alpha, where values of 0.7 and above are generally considered acceptable. In accessibility research,…
- Interpersonal Reactivity Index(also: IRI)
- A widely used multidimensional self-report measure of empathy developed by Mark H. Davis in 1980. The instrument contains four seven-item subscales: perspective taking (the tendency to adopt another's point of view), empathic concern (feelings of warmth and compassion for…
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