USING THE PICTURE EXCHANGE COMMUNICATION SYSTEM (PECS) WITH CHILDREN WITH AUTISM: ASSESSMENT OF PECS ACQUISITION, SPEECH, SOCIAL-COMMUNICATIVE BEHAVIOR, AND PROBLEM BEHAVIOR
USING THE PICTURE EXCHANGE COMMUNICATIONSYSTEM (PECS) WITH CHILDREN WITH AUTISM:ASSESSMENT OF PECS ACQUISITION, SPEECH,SOCIAL-COMMUNICATIVE BEHAVIOR, AND PROBLEM BEHAVIOR