PECS Videos
These videos show the progression through the phases of PECS (Picture Exchange Communication System)
Phase 1 - Learning how to communicate
Phase 2 - Distance and Persistence
Phase 3 - Simple discrimination (between preferred and non-preferred items)
Phase 3 - Conditional discrimination (between two preferred items)
Phase 4 - Sentence Structure
Phase 5 - Responding to 'What do you want?' and extending sentences
Phase 6 - Commenting