To best understand Pervasive Developmental Disorder- Not Otherwise Specified, it is important to first understand what it is not. Often times, PDD-NOS is incorrectly defined as PDD, which is not a diagnosis in itself. PDD refers to the broader spectrum of disorders, which Autism, for example, falls under (Autism Program, 2009).
Thus, PDD-NOS refers to any disorder within the Autistic Spectrum which does not fit the description of one of the other disorders covered within the spectrum.
In addition, it should also be noted that PDD-NOS is also defined as the following:
1. Atypical Personality Develoment
2. Atypical Pervasive Developmental Disorder
3. Atypical Autism
These different forms of PDD-NOS are included in the DSM-IV to include instances of impaired social relationships/communication or abnormal interests/behavioral patterns that do not fit into the specific diagnoses of Autism or PDD.
Above information taken from: (Autism Program, 2009)
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