Glossary

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On Input(also: WCAG 3.2.2)

WCAG 2.1 success criterion 3.2.2 (Level A) requires that changing the setting of any user interface component does not automatically cause a change of context (e.g., submitting a form, navigating to a new page, or moving focus to another component) unless the user has been…

On-Demand Simplification(also: On-demand text simplification, User-initiated simplification)

An interaction pattern for Automatic Text Simplification reading-assistance tools in which the user explicitly requests a simpler version of a word, phrase, or sentence — typically via hover, click, or tap — rather than having the system pre-apply simplifications to the page…

OpenDyslexic(also: Open Dyslexic)

A free, open-source typeface specifically designed to improve readability for people with dyslexia. The font uses heavier bottom portions on letters to help prevent visual rotation and uses unique letter shapes to reduce confusion between similar characters. However,…

Order-Irrelevance Principle

The counting principle that the order in which objects are counted does not affect the total — counting the same set of objects in any sequence will yield the same number. This concept, while intuitive for most people, is often not understood by learners with dyscalculia, who…

Orthographic Depth(also: Orthographic Transparency, Spelling Transparency)

The degree of consistency in the relationship between letters (graphemes) and sounds (phonemes) in a writing system. Languages with shallow or transparent orthography — like Finnish, Spanish, and Italian — have highly consistent letter-to-sound mappings, meaning words are…

Overselectivity(also: Stimulus Overselectivity, Overselective Attention)

A learning challenge in which an individual attends to only one or a few features of a stimulus while ignoring other relevant features, resulting in an inability to discriminate between stimuli that share some characteristics. For example, a child who is overselective might…

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