Pervasive developmental disorders (PDD), as opposed to specific developmental disorders (SDD), refers to a group of five disorders characterized by delays in the development of multiple basic functions including socialization and communication.
There are five types of pervasive development disorders:
- Autism
- Asperger’s syndrome
- Childhood disintegrative disorder
- Rett’s syndrome
- Pervasive development disorder not otherwise specified (PDDNOS)