Pervasive Developmental Disorder Not Otherwise Specified (PDD-NOS) is a developmental disorder that falls on the autism spectrum. Children that are given this diagnose often meet some but not all of the criteria for autism.

The following links describe in more detail specific characteristics of a person with PDD-NOS:

Brain Balance Centers

Emory Autism Center

My Asperger’s Child

National Autism Resources

NINDS

WebMD.Com

Wikipedia