Glossary
Searchable terminology from accessibility, web standards, and related fields.
6660 terms — page 123 of 333
- Flare (Symptom Flare, Flare-Up)
- A temporary but often significant worsening of symptoms associated with a chronic illness, which can last from hours to weeks. Flares can be triggered by environmental factors (heat, pollen, weather c…
- Flash Pattern Analyzer (FPA, PEAT, Photosensitive Epilepsy Analysis Tool)
- Software tools designed to detect potentially dangerous flashing or strobing patterns in digital media that could trigger seizures or other photosensitive reactions. The Harding Flash Pattern Analyzer…
- Flashing Content (Flashing, Flash)
- Visual content that alternates between contrasting states at a rate that can trigger seizures in people with photosensitive epilepsy. WCAG defines a flash as a pair of opposing luminance changes or a …
- Flat Affect (Blunted Affect, Reduced Expressiveness)
- Flat affect refers to a significant reduction in the outward expression of emotions, where a person shows little or no visible emotional response through facial expressions, voice tone, or body langua…
- Flatbed Scanner (Desktop Scanner, Document Scanner)
- A device that uses a flat glass surface on which documents or books are placed face-down to be digitised by a sensor that moves beneath the glass. In assistive technology, flatbed scanners have been u…
- Fleiss's Kappa (Fleiss Kappa)
- A statistical measure of inter-rater reliability for categorical ratings assigned by three or more raters, extending Cohen's Kappa beyond the two-rater case. In accessibility research, Fleiss's Kappa …
- Flesch Reading Ease (Flesch Readability Score, Flesch Score, FRE)
- A readability formula developed by Rudolf Flesch in 1948 that rates text on a 100-point scale based on average sentence length and average number of syllables per word. Higher scores indicate easier-t…
- Flesch-Kincaid Grade Level (Flesch-Kincaid, FKGL, Flesch-Kincaid readability)
- A readability formula that estimates the U.S. school grade level required to comfortably read a given English text, based on average sentence length and average syllables per word. Developed for the U…
- Flexible Learning (Flexible Instruction, Flexible Pedagogy)
- An educational approach that provides students with choices in how, when, where, and at what pace they learn. Flexible learning may include options such as recorded lectures that can be watched at var…
- Flexible Media (Object-Based Media)
- A method of producing audiovisual media in which different components of the content (such as audio tracks, video angles, and subtitle layers) are stored as separate elements and assembled at runtime …
- Flexible Work (Flexible Work Arrangements, Flexible Employment)
- Work arrangements that allow variation in schedule, location, pace, or structure, including remote work, flexible hours, part-time options, and self-directed work. For many disabled people, flexible w…
- Floating Action Button (FAB)
- A circular button that floats above the user interface in Android apps, typically representing the primary action on a screen. Defined by Google's Material Design guidelines, FABs usually display a si…
- Floor Holding (Holding the Floor, Turn Holding)
- The conversational practice of maintaining one's turn to speak, signaling to others that one has not finished and intends to continue. For AAC users, floor holding is particularly challenging because …
- Floor Plan (Floor Map, Building Plan, Building Layout)
- A floor plan is a scaled diagram of a room or building viewed from above, showing the arrangement of rooms, corridors, exits, and other spatial features. In accessibility contexts, floor plans present…
- Flourishing (Developmental Flourishing, Human Flourishing)
- An orientation in design and HCI that measures success not by task completion or outcome equivalence but by the extent to which a system supports individuals' subjective well-being, personal significa…
- Flow (Flow state, Optimal experience, Being in the zone)
- A psychological state of complete absorption in an activity, characterized by focused concentration, loss of self-consciousness, altered sense of time, and intrinsic enjoyment. Coined by psychologist …
- Flow State (Flow, Optimal Experience, Being in the Zone)
- A mental state of complete immersion and focused engagement in an activity, characterized by a balance between challenge level and skill level. In accessible design, achieving flow state is important …
- Flow Theory (Flow State, Flow)
- A psychological theory proposed by Mihaly Csikszentmihalyi describing the state of deep immersion and intrinsic enjoyment that occurs when a person is fully engaged in an activity whose challenge leve…
- Flowchart
- A type of node-link diagram used to represent a process, workflow, or algorithm as a sequence of steps connected by directional arrows. Flowcharts use conventional shape vocabularies (rectangles for p…
- Fluctuating Access Needs (Dynamic Access Needs, Variable Access Needs)
- Accessibility requirements that change over time for a single individual, varying based on factors such as energy levels, symptoms, time of day, environment, medication, menstrual cycle, cognitive loa…