Augmentative and alternative communication, an umbrella term for methods and technologies (e.g. communication boards and speech-generating devices) that help people with a wide range of speech and language impairments to communicate with family, carers and other people. (Source: MOOCAP: ICT Accessibility Glossary, CC-BY 4.0 licence)
The extent to which a product (including software, websites and documents) or service can be used by everyone, regardless of disabilities. (Source: MOOCAP: ICT Accessibility Glossary, CC-BY 4.0 licence)
challenging behaviour
Behaviour is challenging if it is harmful to the person or others around them, which can include hitting or kicking, and if it stops them from being able achieve things in their daily life, such as making friends. (Source: NICE: People with learning disabilities and behaviour that challenges should be better cared for in the community, says NICE, 09.10.2017. )

How to Talk About (People with) Disabilities

The terms used to refer to disorders related to intellectual, cognitive or psychological aspects have change over time. The terms used may also differ from country to country. For example:

See also Cognitive Disability: Information on Intellectual Disabilities on the website Disabled World.

How to Talk (Or Not to Talk) to People with Disabilities

Accessibility, Universal Design, Inclusive Design and Related Concepts

Links to Glossaries

Other Terms and Links

Mutisensory or multi-sensory design is the name of an approach that has been proposed in some publications, for example:

See also Multisensory Instruction: What You Need to Know by Amanda Morin.

Other links:

The term “Asperger's syndrom”, which was listed in the Diagnostic and Statistical Manual of Mental Disorders (DSM-4), was folded into the umbrella term ”autism spectrum disorder“ in DSM-5 in 2013. This change received wider attention after Hans Asperger's relationship with Nazism was discovered. See also the following links: