Communication for the child with ASD is often difficult to learn, and even harder to use when needed. Words may not mean the same thing to an ASD child as they do to you or I. Being unable to communicate effectively has a tremendous impact on a child, and to their family.
Many approaches to teaching communication to ASD children have been tried, some have been successful, some have not. Learning communication skills have to be considered on a case to case basis, based on the abilities and needs of the child.
The Parenting Aspergers Resource Guide: A Complete Resource Guide For Parents Who Have Children Diagnosed With Aspergers Syndrome.