The most important aspect of consistent response from a communication partner during Picture Exchange Communication System (PECS) is consistently providing the requested item or activity *immediately* following a complete exchange of a picture for that item or activity, and pairing that delivery with verbal labeling of the picture and the item/activity. PECS is a structured teaching protocol designed to teach individuals with communication deficits, often those with autism spectrum disorder, to initiate communication using pictures. The core principle is to build communication skills by systematically teaching the individual to exchange a picture representing a desired item or activity (the 'picture') with a communication partner (the person responding) to *obtain* that item or activity.
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