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How does speech and language therapy select appropriate AAC systems for autism? 

Posted
Updated
ByMy Patient Advice
Author: Hannah Smith, MSc | Reviewed by: Dr. Rebecca Fernandez, MBBS

Speech and language therapists (SLTs) play a central role in helping autistic people access augmentative and alternative communication (AAC). As outlined by the NHS and NICE, communication support should be personalised, evidence-informed and responsive to how autism affects understanding, expression and participation across daily life. 

Understanding AAC selection in autism 

AAC includes unaided communication (such as gestures or signing), low-tech supports (for example symbol boards, communication books or written text) and high-tech systems (such as speech-generating devices). According to RCSLT, AAC is not a last resort; it is a valid and effective communication option that can augment or replace speech, depending on the person’s needs and preferences. 

SLTs select AAC systems through a person-centred assessment, rather than matching someone to a pre-set tool. This reflects UK guidance that autistic communication differences are not deficits to be “fixed”, but variations that require thoughtful support. 

Evidence and impact 

According to NICE guidance for children and adults, communication must be adapted to the individual, with reasonable adjustments and multidisciplinary input where needed (CG170; CG142). AAC selection sits within this framework. 

Research evidence consistently shows that AAC does not prevent speech development and may support expressive language and social communication. A large systematic review of AAC interventions in autistic children reported improvements in communication outcomes without negative effects on speech development. More recent reviews of speech-generating devices in autistic preschoolers found moderate to strong effects on expressive communication, particularly for functional language such as requesting (PubMed 40164143). 

Evidence from PubMed also highlights the importance of addressing barriers to AAC use, including limited training for communication partners and poor integration across environments. 

Practical support and approaches 

In practice, SLTs consider multiple factors when selecting AAC, including: 

  • Language profile: understanding, expressive language, and symbolic skills 
  • Motor abilities: fine motor control, alternative access (e.g. switch, eye-gaze) 
  • Sensory preferences: tolerance of sound, visual complexity or screen use 
  • Cognitive and learning profile: attention, memory and learning style 
  • Environments: home, school, work and community settings 

SLTs work collaboratively with the autistic person and those who support them, recognising that AAC systems often need trialling, adaptation and regular review. This aligns with NAS guidance, which emphasises shared responsibility for communication rather than placing the burden solely on the autistic person. 

Challenges and considerations 

AAC selection is rarely straightforward. Some people benefit from simple, low-tech systems, while others need robust high-tech vocabulary to express complex ideas. Research in PubMed shows that AAC outcomes are influenced not only by the system itself, but by how consistently it is modelled and supported across settings. 

Neuroaffirming practice, as outlined in RCSLT autism guidance and reinforced by NHS-linked resources such as Newcastle Hospitals, cautions against using AAC to encourage masking or compliance. Instead, AAC should support autonomy, comfort and authentic communication. 

How services can help 

Within NHS and education pathways, SLTs often work alongside families, schools, employers and other professionals to ensure AAC is understood, modelled and accepted. NICE guidance for adults stresses the importance of reasonable adjustments and accessible communication in health, social care and employment, which includes supporting AAC use beyond childhood. 

Takeaway 

Speech and language therapy selects AAC systems for autistic people through individualised assessment, shared decision-making and evidence-based practice. The goal is not to replace speech unnecessarily or to make someone communicate “normally”, but to ensure they have a reliable, respected way to express themselves and participate in everyday life. 

If you or someone you support would benefit from early identification or structured autism guidance, visit Autism Detect, a UK-based platform offering professional assessment tools and evidence-informed support for autistic individuals and families. 

Hannah Smith, MSc
Author

Hannah Smith is a clinical psychologist with a Master’s in Clinical Psychology and over three years of experience in behaviour therapy, special education, and inclusive practices. She specialises in Applied Behavior Analysis (ABA), Cognitive Behavioural Therapy (CBT), and inclusive education strategies. Hannah has worked extensively with children and adults with Autism Spectrum Disorder (ASD), ADHD, Down syndrome, and intellectual disabilities, delivering evidence-based interventions to support development, mental health, and well-being.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the author's privacy. 

Dr. Rebecca Fernandez, MBBS
Reviewer

Dr. Rebecca Fernandez is a UK-trained physician with an MBBS and experience in general surgery, cardiology, internal medicine, gynecology, intensive care, and emergency medicine. She has managed critically ill patients, stabilised acute trauma cases, and provided comprehensive inpatient and outpatient care. In psychiatry, Dr. Fernandez has worked with psychotic, mood, anxiety, and substance use disorders, applying evidence-based approaches such as CBT, ACT, and mindfulness-based therapies. Her skills span patient assessment, treatment planning, and the integration of digital health solutions to support mental well-being.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the reviewer's privacy. 

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