AAC provision for children and young people in England 👉 See the PDF 40 ‐ 60% of people with learning disabilities also have communication difficulties. This means they are likely users of low tech AAC such as signs and symbols (Mencap). Landmark international research in 1999 indicated that 0.4 ‐0.6% of the population need AAC (Augmentative Communication News) 0.05% of children and young people in the UK need high technology AAC.