I know he can discriminate pictures and using PECS has definitely helped in his ability to request his wants and needs, but that is as far as
PECS can go.
PECS is a communication system, not a language. For a long time, he did not imitate any gross or fine motor actions therefore, using sign was not an option for him to use. We have been using it and now, FINALLY, he is responding to our SOME of our directions given in sign.