one way to restore symmetry may be to provide linguistic input via speech and via the AAC systems with which the children are expected to communicate (e.g., Harris & Reichle, 2004). For preschoolers who use aided AAC, this means providing input using the children’s AAC systems in addition to natural speech. If the input – output asymmetry typically experienced by children using aided AAC contributes to their limited linguistic output – including the relative lack of multi-symbol productions – then providing input via AAC should have a positive impact on their productive language skills.