If a chimp can learn sign language, surely my nonverbal client can too.
D000328:Adult; D000818:Animals; D002170:Canada; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007806:Language Disorders / Q000534:rehabilitation*; D008369:Manual Communication; D002679:Pan troglodytes; D012813:Sign Language; D014481:United States