Most people with intellectual disability have poor literacy skills. Written materials are likely to confuse them unless attempts are made to accommodate their literacy level.
Some people may attempt to hide their lack of understanding of written material. For example, they might say that they have read and understood a statement and sign it as a true and accurate record of a conversation when they do not have the literacy level required to read the statement.
If it is necessary to use written correspondence with the client, adopt plain and simple English.
Where possible, have someone go through any written material with the client at their pace, so that any misunderstanding can be clarified. Then, check the client’s understanding by asking them to explain their understanding of the material. (For more information, see the section: ‘Attention and memory’.)