What is AAC and who might benefit from it?

AAC is often pictured as a tablet that speaks when somebody touches symbols. That is one form, but the term is much wider.

Augmentative communication adds to speech. Alternative communication provides another way to communicate when speech is not available or does not carry enough of the message. The same child may use speech in one moment, point to a paper board in another and type a detailed answer later.

AAC is not a single device, a final stage or a judgement about what a child will eventually be able to do. It is a way of increasing access to communication now.

What can count as AAC?

The Royal College of Speech and Language Therapists describes AAC as a collective term for tools, techniques and interventions that enhance communication.¹ It includes methods that need no equipment and methods that use an aid.

Unaided communication can include:

• gesture;
• facial expression;
• body movement;
• signing; and
• agreed hand signals.

Aided, non-electronic communication can include:

• real objects or objects of reference;
• photographs;
• picture or symbol cards;
• communication books and boards;
• choice displays;
• alphabet boards; and
• pen and paper.

Electronic AAC can include:

• a speech-generating device;
• a communication app on a tablet or phone;
• a switch-accessed system;
• eye-gaze access; and
• text-to-speech.

Oxford Health NHS Foundation Trust describes AAC as ranging from objects, pictures, symbols and signing to electronic communication aids, used as a bridge, support, supplement or alternative to speech.²

No one form is automatically more legitimate. A printed board may be faster at the swimming pool. A device may hold a large vocabulary for school and conversation. Gesture may work with familiar people but fail with a new clinician. The child may need a combination.

Who might benefit?

AAC may be relevant when speech is absent, difficult to understand, unreliable, effortful or insufficient for what the child wants to express. It can also help when speech changes with fatigue, pain, anxiety or overwhelm.

Possible reasons for considering assessment include:

• unfamiliar people cannot understand the child's speech;
• the child can request a few things but cannot comment, ask questions or explain a problem;
• speech disappears or becomes much less available in some settings;
• motor or physical needs affect speech;
• the child relies on behaviour that others must guess;
• communication breakdown is restricting learning, relationships, consent or safety; or
• an existing system is too limited, slow, inaccessible or inconsistently supported.

The RCSLT states clearly that there are no prerequisites for AAC assessment.¹ A child should not have to demonstrate cause and effect, match pictures, reach a particular age or prove that speech intervention has failed before their communication needs can be considered.

Assessment does not guarantee a particular device. It creates the opportunity to understand what the person needs and which approaches might give them more control.

AAC does not have to replace speech

Families are sometimes told to choose between encouraging speech and introducing AAC. That is a false opposition. The A in AAC includes augmentative: the system may work alongside spoken words.

A child can say the word they have, point to a symbol for the missing detail and gesture towards the person involved. Adults should respond to the combined message rather than accepting only the spoken part.

Do not remove AAC because the child has begun speaking more. Speech can vary across people, places and levels of stress. The alternative method remains part of the child's communication access unless an individual review with the child supports a change.

The evidence base for different AAC interventions, populations and outcomes is varied. It would be misleading to promise that a system will produce speech or a specific developmental result. The immediate purpose is communication and participation.

What should an assessment consider?

Good AAC assessment is not a product demonstration followed by a purchase. RCSLT guidance describes assessment and provision as collaborative, involving the person, family, communication partners and relevant professionals, with ongoing review rather than a one-off decision.¹

The team may need to consider:

• what the child already communicates and how;
• what they want and need to communicate next;
• understanding of language and symbol representation;
• vision, hearing, movement, posture and access method;
• sensory preferences and fatigue;
• literacy and opportunities to develop it;
• languages used by the family;
• settings, including wet, noisy, bright or mobile environments;
• speed and effort;
• who will learn to support the system;
• charging, repair, replacement and backups; and
• how the vocabulary will grow with the child.

NHS England's commissioning guidance distinguishes local AAC provision from specialised services for people with more complex needs.³ Pathways and responsibilities differ between UK nations and local areas, so families may encounter different referral routes.

Ask the assessing service who owns each next step: trial, funding, programming, training, maintenance and review.

Look beyond choosing between two things

A board with biscuit and drink can help a child request, but communication is larger than obtaining items. The child needs ways to:

• say no and stop;
• ask for help or a break;
• report pain;
• greet and call somebody;
• comment and share information;
• ask questions;
• tell a story;
• joke and complain;
• express uncertainty;
• repair a misunderstanding;
• talk about people and events beyond the present room; and
• say something adults did not predict.

A system that contains only adult-approved choices may improve routines while leaving the child unable to challenge, disclose or initiate. Ask whether the vocabulary supports autonomy as well as compliance.

The system must be available

AAC cannot work from a cupboard, the adult's bag or a charging point in another room. Keep it within the child's reach across ordinary activities, transitions and distress. Provide a reliable low-tech backup for bathing, outdoor play, travel, power loss or repair.

Do not take a device away as a behaviour consequence. If it is also used for games or video, separate the rules around entertainment from access to the communication system.

During overwhelm, place the established system within reach but do not insist that the child use it. The article on how to keep communication available during overwhelm explains why access and demand are different.

Communication partners need to learn too

The child cannot make AAC work alone. Adults and peers need to know where the system is, how the child accesses it and how long to wait.

They may model language by using the same symbols while they speak, without requiring the child to copy. They should respond to attempts, accept multimodal messages and check interpretations. They also need to resist speaking for the child merely because it is faster.

Try:

"I think you are saying the noise hurts. Is that right, or did I miss it?"

Then give time and a way to correct you.

The child should be able to use ordinary personality through AAC. If vocabulary includes please but not no, happy but not bored, and school topics but not the child's interests, the system reflects adult priorities more than the person using it.

Judge it in real life

A child may select symbols accurately in a quiet clinic but be unable to carry, see or access the same layout in class. A system may work with a trained therapist and fail when nobody at a club waits for it.

During a trial, record:

• where communication became easier;
• messages the child initiated without prompting;
• messages still unavailable;
• physical or sensory barriers;
• how much partner support was needed;
• what happened during fatigue or distress;
• whether the child chose the system; and
• what the child said about it through any reliable method.

Avoid measuring success only by the number of button presses. A single independent "stop" that is understood and respected may matter more than repeated prompted requests.

Plan for transitions between settings

A system can fail at the boundary between home, school and health services even when it works in each assessment session. Ask who updates vocabulary before a new school, work-experience placement or hospital visit. Check that essential words appear in the same predictable place where possible, and that unfamiliar adults know how the child indicates yes, no and uncertainty. Send the low-tech backup with the child rather than assuming another setting will have a compatible board.

When equipment belongs to a service, clarify what happens during holidays, repair and a change of placement. The child needs communication while organisations decide responsibility. Record model details, access settings and key contacts somewhere the family can reach without relying on the device itself.

If the child rejects the system

Rejection is information, not proof that the child does not need AAC. The vocabulary may be irrelevant, the layout too hard, the voice uncomfortable, the device stigmatising, the access method tiring or previous use too heavily prompted.

Ask what can change. Offer access without making every interaction a practice session. Keep the child's current communication methods respected while the team reviews the problem.

For a child who speaks little or not at all, the next article explains how to support communication without treating speech as the only evidence of thought. Individual assessment remains essential because AAC provision must fit the person, not the diagnosis.

The most advanced system is not the one with the most features. It is the one the child can access, chooses to use and can rely on other people to hear.

Footnotes

1. RCSLT's May 2024 guidance defines AAC broadly, states that there are no prerequisites for assessment and describes collaborative, regularly reviewed provision. ↩ ↩² ↩³

2. Oxford Health gives examples of unaided, paper-based and electronic AAC and describes its possible role alongside or instead of speech. ↩

3. NHS England's commissioning guidance explains local and specialised AAC roles in England. Structures differ elsewhere in the UK and may change locally. ↩