AAC and multimodal communication

• Approach family: Augmentative and alternative communication (AAC) and multimodal communication
• Primary purpose: Secure effective, available and self-directed ways for a young person to understand and express communication across contexts
• Primary discipline: Speech and language therapy
• Contributing disciplines: Education, occupational therapy, assistive technology, psychology, health, social care, family support and specialist sensory services
• Typical settings: Home, education, health, care, transport, community, leisure and work-transition settings
• Typical users: Young people whose speech, language, literacy or access does not reliably meet all communication needs, whether the need is lifelong, acquired, temporary, intermittent or context-dependent
• Typical tier: Universal multimodal access, targeted system support or individualised assessment and intervention

AAC comprises methods that supplement speech or provide an alternative when speech is absent, unavailable, unreliable, unsafe, insufficient or too costly for the message or context. A multimodal communication system may combine speech, vocalisation, facial expression, body movement, gesture, manual sign, objects, photographs, symbols, drawing, writing, typing, communication boards, books, switches, eye gaze and speech-generating technology.

A018 concerns the whole communication system: modes, symbols, vocabulary, access method, equipment, teaching, partner knowledge, opportunities, backup, maintenance and review. It is not synonymous with a tablet or app. It is not a single programme, and named systems such as Picture Exchange Communication System (PECS), Makaton, Pragmatic Organisation Dynamic Display (PODD) or particular devices should retain their own protocol and evidence boundary.

The approach may work alongside, but is not the same as:

• A017 Communication partner strategies, which changes how other people notice, support and respond to communication;
• A006 Visual and anticipatory supports, which makes information, sequence, choice or change more visible but may not provide a generative expressive system;
• A020 Explicit instruction and modelling, which is a wider teaching family that may be used to teach AAC;
• A005 Environmental adaptation, which changes broader physical, sensory, social, temporal or task conditions;
• speech and language therapy, occupational therapy or assistive-technology provision as services;
• Facilitated Communication, Rapid Prompting Method or any technique in which another person may determine the message.

Multimodal does not mean that every mode is equally available or equally safe in every context. Speech may work in one lesson and not after overload; a touchscreen may be effective at a desk but inaccessible outdoors; signing may be efficient with familiar partners but not understood in hospital. The record must identify what works, for which functions, with whom and under what conditions.

Pictures: distinguish the function

A picture’s appearance does not identify the intervention. Describe what the young person and partner use it to do.

Use	What the picture is doing	What to check
Speech-production cue	Prompts practice of a speech sound, word or sequence.	Record the speech target and cueing; a practised spoken response is not by itself an independently chosen message.
Step display	Shows the order of tasks or the steps within an activity.	Record what the sequence makes understandable and how the person can question, change or stop the activity.
Expressive AAC	Lets the person independently select or compose a message, including refusal, a question or an unanticipated idea.	Check access, authorship, partner response and the range of messages available.

These functions can coexist. Visual schedules can be part of AAC, and AAC can support understanding as well as expression. A step display does not by itself describe the whole expressive system. Keep the person’s usual communication available during speech practice; neither speaking a target nor following a sequence proves that they can communicate what they want. American Speech-Language-Hearing Association (ASHA) AAC guidance describes both visual schedules and expressive symbol use; the Nuffield manual excerpt, pages 73–74 illustrates picture-supported speech practice. This comparison distinguishes functions and makes no claim about comparative programme effectiveness.

Begin with communication purposes and rights

Map what the young person needs and wants to communicate: consent and refusal; pain and health; choice; asking and answering; commenting; joking; storytelling; learning; relationships; identity; privacy; repair; protest; disclosure and emergency messages. Include communication the person initiates, not only responses to adult prompts.

Assess the person in real contexts

Use a collaborative, culturally and linguistically responsive assessment led or supported by a suitably skilled speech and language therapist. Consider receptive and expressive language, literacy, motor access, posture, vision, hearing, sensory profile, fatigue, attention, memory, current modes, preferences, partner competence and environmental demands. Observe across meaningful settings and states. Diagnosis alone does not select a system.

Trial modes and access methods

Offer genuine trials of unaided, low-technology and high-technology options. Selection may be direct through touch, pointing, gaze or movement, or indirect through switch or partner-assisted scanning. Compare accuracy, speed, fatigue, independence, learning demand, portability, repair and the person’s preference. A successful trial is not simply the production of prompted correct answers.

Build a flexible language system

Provide vocabulary for a broad range of functions, including core language and personally important fringe vocabulary. Allow novel messages where possible. Vocabulary should reflect the person’s age, interests, relationships, identity, languages and culture, with access to words for refusal, uncertainty, bodily states, safeguarding and “something else”. Plan how vocabulary and representation will grow.

Protect access and provide backup

The system must be available, charged, positioned and operable wherever communication matters. Treat it as the person’s communication, not as a discretionary classroom device. Provide robust low-tech or no-tech backup for power loss, damage, water, transport, evacuation, fatigue and contexts in which the primary method cannot be used. A backup must be known to the person and partners before a crisis.

Teach through meaningful use and modelling

Partners can model language in the system while speaking, arrange authentic opportunities, wait, respond and expand. Teaching should support linguistic, operational, social and strategic competence without making every conversation a therapy trial. Prompting must be planned and faded; physical control of the person or message is not acceptable.

Train and support partners

Family, staff and other important partners need practical instruction in access, modelling, vocabulary, waiting, interpretation, repair and technical care. Include unfamiliar-partner communication and staff turnover. No system is independent in practice if only one adult knows how it works.

Review outcomes, effort and authorship

Measure whether the person can communicate meaningful messages more successfully and independently, across people and settings, and at an acceptable effort and emotional cost. Check system use, partner behaviour, participation, repair and preference. Confirm that message selection is observable and authored by the young person.

AAC and multimodal communication may include:

• recognising speech, gesture, body movement, sign, symbols, writing and technology as valid parts of one repertoire;
• a communication board or book available alongside a speech-generating device;
• a stable way to communicate “yes”, “no”, “stop”, “not sure”, “later” and “something else”;
• direct touch, keyguard, stylus, head pointing, eye gaze, switch scanning or transparent partner-assisted scanning;
• symbol, photograph, object, tactile, alphabetic or text-based representation selected for the person;
• core vocabulary for flexible language alongside names and context-specific words;
• vocabulary for pain, location, people, emotions, privacy, consent and safeguarding;
• the young person choosing or helping choose voice, language, symbol, layout and personal vocabulary;
• partners modelling messages without requiring imitation or immediate response;
• adequate processing time and a reliable repair routine;
• communication opportunities beyond requesting preferred items;
• the system remaining within reach during lessons, meals, breaks, transport, healthcare and distress;
• a low-tech backup stored in known places and carried on trips;
• planned charging, software support, mounting, cleaning, replacement and data protection;
• transition records so communication access survives changes of class, service or placement;
• regular review as language, motor skills, relationships, identity, settings and preferences change.

AAC should not be reduced to frequency of device touches. A person may communicate an important refusal once, compose a novel message slowly, use gesture because it is quicker, or choose silence. Effectiveness is the increased ability to communicate what matters—not conformity to one mode.

Tier 1 — Universal multimodal access

Create environments in which speech is not the only accepted route. Make key information available in accessible formats, allow response through different modes, give time, respond to credible attempts and ensure staff know how to locate and respect an individual’s communication system. Universal practice cannot replace individual AAC assessment.

Tier 2 — Targeted communication support

Provide selected young people or groups with defined low-tech, sign, symbol, written or technology-supported options for recurring contexts, with partner training and outcome review. Targeted provision should not become a holding stage that delays comprehensive assessment when communication needs are complex.

Tier 3 — Individualised AAC system

Undertake collaborative, transdisciplinary assessment and trials; specify access, representation, vocabulary, equipment, partner instruction, backup, maintenance, funding and transition. For complex physical, sensory or high-stakes communication needs, include specialist AAC, occupational therapy, vision, hearing, seating or assistive-technology expertise as relevant.

This is a constructed illustration of the approach, not a reported case or an observed outcome.

Imagine a young person who uses speech in some situations and prefers typing when speech is harder to use. They want dependable ways to ask a new question, refuse and explain that they need more time. An individual communication plan considers their chosen modes, personally relevant vocabulary, access to the system and an acceptable backup. Partners agree to wait and to check consequential messages without taking authorship away from the young person.

Review would record whether the person could communicate the intended message, whether the system was available, the time and support involved, and their view of control. More use of a device would not by itself count as progress. A partner’s interpretation would be documented separately from a message independently authored by the young person.

1. Why the evidence boundary matters

augmentative and alternative communication (AAC) research encompasses different populations, technologies, symbols, access methods, teaching procedures, communication partners and outcomes. Some studies test a complete package; others test a device, exchange procedure, aided model or partner intervention. Combining them into “AAC works” conceals what was delivered and for whom.

The appropriate unit is a specified communication system and implementation plan. Phoenix separates evidence that a particular intervention increased requesting, initiations or speech from the broader rights-and-practice case for making communication accessible. Both matter, but they answer different questions.

2. Communication is multimodal and context-dependent

Most people combine modes. For a person with communication disability, the balance may be more visible and may change sharply with fatigue, anxiety, pain, motor state, sensory load, partner familiarity or message complexity. Speech on one occasion does not prove speech will be available for a later high-stakes message.

A system should therefore be flexible enough to add modes without ranking the person’s authentic communication by how closely it resembles speech. Augmentative use is not failed speech. Alternative use is not failed personhood. The criterion is whether the person can understand and be understood with adequate independence, precision, dignity and safety.

3. What controlled and systematic evidence shows

The 2018 Cochrane review of communication interventions for minimally verbal autistic children found only two eligible randomised trials and rated the overall evidence very low. In the AAC study, use of the picture-exchange system and some initiations increased, but expressive vocabulary and broad social-communication effects did not clearly improve. The review demonstrates both a possible focused benefit and the fragility of broad claims.

A 2021 systematic review found AAC interventions generally associated with improved speech production in autistic children, but speech gains did not exceed AAC use. Reviews of interventions extending beyond requesting identify emerging evidence for broader communication functions, alongside weaknesses in maintenance, generalisation and social validity. More recent work combining naturalistic developmental behavioural interventions with AAC is promising but remains evidence for those packages, not for every form of AAC.

4. AAC need not wait for speech to fail

Clinical guidance treats AAC as augmentative, alternative or temporary and recognises combinations of unaided, low-tech and high-tech modes. There is no defensible prerequisite ladder in which a person must first fail speech therapy, match pictures, sit still or show a particular intellectual level. Assessment is used to find access and representation that work, not to decide whether the person has earned communication.

The speech-suppression concern is also misplaced. Available reviews do not show AAC preventing speech, and some report speech gains. Speech may remain valuable and preferred, but the outcome should not be defined so narrowly that effective non-speech communication is counted as failure.

5. The system extends beyond technology

An AAC system includes forms, symbols, vocabulary, selection techniques and strategies. Its use depends on physical positioning, charged equipment, mounting, access to language, partner response and opportunities. Provision without implementation is not access.

High technology can support novel language, voice output and portability, but can fail through cost, breakage, battery, updates, glare, sound, connectivity, restrictive school policies or unavailable technical support. Low-tech methods can be quick and robust but may constrain vocabulary, privacy or unfamiliar-partner comprehension. A planned repertoire and backup are safer than a prestige hierarchy.

Systems dominated by nouns and requests can make a person appear less linguistically capable and less socially interested than the system permits them to show. Communication requires verbs, descriptors, questions, comments, disagreement, uncertainty, humour, relationships and private language. It also requires vocabulary that reflects home languages, dialect, culture, age, gender and identity.

Adults inevitably influence available vocabulary, which creates an obligation to review whose priorities are represented. The person needs routes to reject a suggested message, change the subject and communicate something no one anticipated.

6. Partner competence is part of the intervention

Partners need to recognise modes, make the system available, model without demanding imitation, allow time, respond and repair. If adults ask questions faster than a person can navigate, accept speech but ignore AAC, or repeatedly prompt the expected icon, the measured difficulty may belong partly to the interaction.

A017 addresses partner behaviour directly. In A018, partner support remains an indispensable system component. The distinction prevents a device outcome from being attributed solely to the young person while also preventing generic partner advice from substituting for AAC assessment and language access.

7. Minimum monitoring

Monitoring should link implementation to meaningful outcomes:

• availability and reliability: access in relevant contexts, downtime, backup and technical failures;
• authorship and independence: type and amount of prompting, observable selection and ability to correct;
• communication function: initiation, response, refusal, comment, question, repair, social connection and novel messages;
• range and quality: vocabulary growth, precision, complexity and successful unfamiliar-partner communication;
• participation: learning, healthcare, relationships, decisions, community and safety;
• efficiency and cost: time, motor or cognitive effort, fatigue, frustration and recovery;
• experience: preference, control, privacy and whether the person wants to use or change the system;
• generalisation: use with different partners, settings and emotional or physical states.

Frequency alone can mislead. A small number of independently authored, consequential messages may matter more than many prompted selections.

8. Cautions, safeguarding and equity

Never remove, withhold or lock a communication system to encourage speech, control behaviour or manage ordinary screen-time limits. Never withhold food, drink, toileting, medication, pain relief, safety or regulation to elicit a request. Preserve access during distress and restrictive interventions wherever safely possible.

Facilitated Communication and Rapid Prompting Method, including approaches described as Spelling to Communicate, carry serious authorship concerns. A facilitator must not guide, cue or control the selection. These techniques are distinct from independent typing and from transparent partner-assisted scanning using predetermined options and an agreed observable response. Consequential messages require especially careful verification without silencing the person.

Equity depends on timely assessment, funding, repairs, internet or charging where needed, culturally and linguistically relevant vocabulary, accessible voices and competent services. Do not treat a family’s ability to buy equipment or attend repeated training as commitment. Protect stored messages and personal data; decide who can edit vocabulary; and preserve private communication appropriate to age and capacity.

9. What we can say

• AAC can supplement speech, replace it for some messages or contexts, or provide temporary and backup communication.
• Defined AAC interventions have improved specific communication outcomes in many studies, although certainty and transfer vary.
• Available evidence does not show AAC suppressing speech; some studies report speech gains.
• Comprehensive assessment, trials, individualised access, broad vocabulary, partner instruction, continuous availability and backup are central implementation features.
• A person may need different modes across settings and states.
• Communication, participation, autonomy, effort and experience are more meaningful outcomes than device use alone.

10. What we cannot say

• We cannot claim that one device, symbol system, access method or branded programme is best for everyone.
• We cannot infer broad language, wellbeing, friendship or educational effects from improvement in requesting or prompted trials.
• We cannot assume that speech heard in one context is reliable in every context.
• We cannot treat provision of equipment as successful implementation.
• We cannot infer independent authorship when another person controls or cues selection.
• We cannot assume that non-use reflects lack of ability; the system, vocabulary, access, partner response or cost may be wrong.
• We cannot substitute universal visual supports or generic staff awareness for individual AAC assessment where it is needed.

11. Review, exit and escalation

At review, ask whether the young person can communicate a broader and more personally meaningful range of messages; whether access is reliable across people, places and states; what prompting and effort are required; whether partners respond; what the person prefers; and whether the system creates new barriers or risks.

Escalate to specialist speech and language therapy, AAC, occupational therapy, vision, hearing, seating, neurology or other relevant services when access is uncertain; communication changes suddenly; motor, sensory or health factors interfere; the person lacks a reliable route for pain, consent, refusal or safeguarding; equipment repeatedly fails; or authorship is disputed. Sudden loss of communication may require urgent medical assessment.

An intervention phase may end when goals are met, a trial is rejected, or a better system replaces it. Communication access itself does not “graduate”. Continue maintenance, vocabulary development, repairs, partner induction and review for as long as the person uses the system.

12. Phoenix judgement

AAC and multimodal communication is a favourable, rights-critical and highly individual approach family. Direct research supports meaningful benefits from defined interventions, but the evidence is heterogeneous and often focused on narrow outcomes or small samples. Guidance and recipient accounts strengthen the case for timely access, flexibility and partner competence.

A useful plan specifies the communication purposes, access method, modes, vocabulary, teaching, partner actions, backup, technical support and review outcomes. The approach should expand the person’s communicative power, not replace one narrow performance demand with another. The central question is simple: can the young person say what they mean, when it matters, in a way they can own?

Shared evidence profile fields

For AAC, identify the communication system, access method, partner support and communication purposes together. A result for one mode, population or teaching package does not rate every AAC system.

The following fields make a specific evidence or implementation record comparable with other Atlas profiles. They do not supply missing study data or replace the source-specific judgements in this entry.

• Identity and version: Name the component or programme, its edition or protocol where relevant, and the purpose being evaluated.
• Source role: Separate direct comparative evidence, descriptive implementation findings, guidance, theoretical support and firsthand experience.
• Population and setting: Retain the studied age, communication/access characteristics and setting. State when an intended application lies outside them.
• Intended and actual delivery: Record the planned components and dose separately from what was received, by whom, and with what support or interruptions.
• Comparison and other support: Name the actual comparison and concurrent changes. If there is no comparison group or it is unreported, say so rather than supply an assumed usual-care condition.
• Outcome and reporter: Record the outcome, time point and reporter. Keep the young person’s account separate from proxy judgement, and access or participation separate from task performance.
• Fidelity and adaptation: Record whether the core components were delivered and describe adaptations; distinguish an adapted application from the protocol tested.
• Burden and unwanted effects: Record time, effort, practical access, cost or workload where known, alongside refusal, fatigue, distress, restriction and other unwanted consequences. Unreported burden is not evidence of no burden.

• ASHA — Augmentative and Alternative Communication practice portal
• RCSLT — Augmentative and alternative communication guidance
• Brignell and colleagues — Cochrane review of communication interventions for minimally verbal autistic children
• White and colleagues — AAC and speech production in autistic children
• Logan, Iacono and Trembath — AAC interventions beyond requesting
• Pope, Light and Laubscher — Naturalistic developmental behavioural interventions and AAC
• Donaldson, Corbin and McCoy — Everyone Deserves AAC
• Zisk and Dalton — AAC for speaking autistic adults
• ASHA — Facilitated Communication position statement
• ASHA — Rapid Prompting Method position statement

These working tags describe the approach’s focus. Conditional connections depend on the particular barrier, goal and application. Professional delivery roles remain recorded separately.

Direct focus

• 03 Communication & connection — A whole multimodal system supports understanding and expressing personally meaningful messages.
• 06 Agency, safety & participation — Continuous access, independent authorship, refusal, consent, choice and self-directed participation are explicit core components.

Conditional connections

• 04 Learning & making meaning — Relevant when an identified literacy or learning component is part of system development; a device alone does not establish it.
• 05 Sensory, body & environment — Relevant when motor, posture, vision, hearing or sensory access determines system selection and use.

These entries offer related reading for the situations described. A link expresses the specific connection below; it does not establish individual suitability or an effect of the approach.

• E012 Difficulty communicating needs — Read alongside this approach when a person needs dependable ways to express needs, ask questions, refuse or repair misunderstanding. The aim is access to their intended message across relevant settings.
• E068 Difficulty communicating when under pressure — Read alongside this approach when speech or another familiar mode becomes less available under pressure. Plan access to acceptable alternatives and allow the time needed to compose a message.
• E094 Difficulty saying no or expressing discomfort — Read alongside this approach when accessible communication affects whether a person’s preference can be expressed and heard. Equipment or observable choice-making alone does not establish that the preference was authored or respected.