This caregiver-friendly, digital and printable handout defines speech and basic speech development and discusses the role of AAC for communicators without speech, with limited speech, and with unreliable speech.  Includes research references.  This is a printable adapted from a blog post series in using typical development to guide AAC philosophy (Back to Basics:  What is Speech?  And What's AAC Got to Do with It?).  See the other products related to communication development in our store!