Autism is a neurological disorder affecting social skills, development, language and behaviour. It is estimated to affect one out of every one hundred and sixty six children in North America. It was first discovered in the 1940s by Dr. William Kanner and Dr. Hans Asperger.
Entire novels have been written on the subject of defining autism, and there is no easy way to sum up a disorder so varying and vast in a few short paragraphs.
Debates range on the causation of autism and tempers get heated rather quickly when discussions come up about the treatment protocol for autistic children and adults. This wiki is not about debate, rather, information
I hope that somewhere in the pages of this wiki you will find the answers you are looking for.
There are five main subcategories of Pervasive Development Disorders or PDD. They include:

• Autism Disorder
• Asperger's Disorder
• Childhood Disintegrative DIsorder (CDD)
• Rett's Disorder
• Pervasive Developmental Disorder - Not Other Specified (PPD-NOS)

The signs and symptoms of autism are vast and vary from child to child.