Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Partner Training(also: Communication Partner Training, Interlocutor Training)
- Education and coaching provided to the communication partners of AAC users to help them interact more effectively and supportively. Partner training covers strategies like allowing adequate time for responses, recognizing non-verbal and device-mediated communication cues,…
- Perplexity(also: Language Model Perplexity)
- A standard metric for evaluating language models that measures how well the model predicts a sample of text. Mathematically, perplexity is the inverse probability of the test set, normalised by the number of words — a lower perplexity indicates that the model assigns higher…
- Personal Narrative(also: Storytelling, Conversational Narrative)
- The act of telling others about one's own experiences, events, and feelings — a fundamental aspect of human social interaction. Personal narrative serves multiple functions: building and maintaining relationships, developing identity and sense of self, processing experiences…
- Pictograms(also: Pictogram, Picture Symbols, PCS)
- Simplified pictorial symbols that represent concepts, objects, activities, emotions, or places, widely used as a form of augmentative and alternative communication (AAC) and as a visual support for autistic individuals, minimally verbal users, and people with cognitive…
- Picture Communication Symbols(also: PCS, Boardmaker Symbols)
- A widely used graphic symbol system for augmentative and alternative communication (AAC), consisting of simple, colorful line drawings representing words, phrases, and concepts. Developed by Mayer-Johnson (now part of Tobii Dynavox), PCS is one of the most common symbol sets…
- Picture Exchange Communication System(also: PECS)
- A structured augmentative and alternative communication (AAC) system that teaches individuals to use pictures to communicate with others. Developed by Andrew Bondy and Lori Frost in 1985, PECS uses a series of six phases to teach individuals — typically children with autism or…
- Pre-Programmed Message(also: Stored Message, Canned Response, Pre-Set Phrase)
- A message or phrase stored in an AAC device that can be quickly retrieved and spoken without requiring real-time composition. Pre-programmed messages trade expressiveness for speed—they enable faster communication but are limited to anticipated phrases. For backchanneling,…
- Prediction Utilization(also: PU)
- The percentage of opportunities where a user accepts a word prediction rather than continuing to type the word manually. Prediction utilization reflects user trust in a prediction system—higher quality predictions lead to higher utilization rates. Research shows that users…
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