Glossary
Searchable terminology from accessibility, web standards, and related fields.
15 results found in Accessibility Metrics.
- Automatic Caption Evaluation (ACE, ACE Framework, ACE Metric)
- A caption-quality evaluation framework introduced by Sushant Kafle and Matt Huenerfauth (2017-2018) that scores automatically generated captions based on their usability for Deaf and Hard-of-Hearing r…
- Caption Quality (Subtitle Quality)
- The overall fitness of a set of captions or subtitles for their intended accessibility purpose. Quality is multi-dimensional: it includes text accuracy (whether spoken words are correctly transcribed,…
- Discriminative Ability (Discriminative ability of a metric, Discriminability)
- In accessibility research methodology, the property of an evaluation metric to reveal statistically significant differences between stimuli that are known to differ along the dimension being measured.…
- Failure Rate (FR (accessibility metric))
- An accessibility metric introduced by Sullivan and Matson (2000) that, for a given page and a given checkpoint, divides the number of checkpoint violations found by the maximum number of violations th…
- 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…
- Fluency (Text fluency, Grammatical fluency)
- In natural language processing and text simplification, fluency is the degree to which a piece of text is grammatically correct and reads naturally in the target language. It is one of three standard …
- Grammaticality (Grammatical correctness, Grammatical acceptability)
- The degree to which a sentence conforms to the grammatical rules of a language. In accessibility and NLP research, grammaticality is typically assessed via a 5-point Likert subjective judgement (e.g.,…
- Listenability (Auditory Readability, Speech-Output Quality)
- A web-accessibility usability metric that measures how appropriate a page's rendered text is when read aloud by a screen reader or voice browser — complementary to, and distinct from, raw WCAG conform…
- Literacy Bias (Literacy bias of a metric)
- In accessibility research methodology, a literacy bias describes the phenomenon where an evaluation metric systematically produces different scores for participants with different reading-literacy lev…
- NER Model (Number, Edition, Recognition Model, NER Accuracy Model)
- A caption-quality evaluation model developed by Pablo Romero-Fresco and Juan Martínez Pérez for measuring the accuracy of live subtitling and respeaking. Unlike Word Error Rate, which penalises all er…
- Quality of Perception (QoP)
- An evaluation framework from the multimedia-accessibility research literature for measuring how well a user can understand and use a media presentation, combining objective comprehension metrics (e.g.…
- SARI (System output Against References and against the Input sentence)
- An automatic evaluation metric for text simplification systems that compares a system’s output against both the original input sentence and a set of human-written simplification references, rewarding …
- Score Prediction (Predicted grade, Comprehension self-prediction)
- A subjective-response evaluation item in which a research participant, immediately after reading a passage and before learning their actual comprehension-question score, estimates the percentage of qu…
- Sense of Control (Perceived control, Locus of control (task-level))
- A psychological construct describing a user's subjective feeling of agency over what a system does, distinct from objective control measures such as available options or task-completion rates. In acce…
- Text Complexity (Linguistic complexity, Text difficulty)
- The degree to which a piece of writing demands advanced reading skills to comprehend, driven by factors such as vocabulary frequency, syntactic structure, sentence length, passage organisation, and ba…