Why is multimodal communication important when using PECS?

PECS, or Picture Exchange Communication System, is a widely used augmentative and alternative communication (AAC) system. AAC refers to methods used to support communication for individuals who have difficulty with spoken language. PECS initially relies on exchanging pictures to request items or activities. However, multimodal communication—using multiple modes of communication simultaneously—becomes increasingly important as PECS progresses beyond basic requests and to support more complex communication. Multimodal communication involves combining visual, auditory, gestural, and other non-verbal cues alongside the picture exchange. Initially, a child using PECS might exchange a picture of a juice box to receive juice. This is primarily a visual exchange. As communication skills develop, simply exchangi....