Unfortunately, the diagnostic category of pervasive development disorder-not otherwise specified (PDD-NOS) does not have specific criteria and is often seen as a catchall diagnosis for children who do not fit the criteria for one of the other pervasive developmental disorders ( Filipek et al., 1999).Īccording to Cohen & Volkmar (2005) classification systems should aim at improving communication, through their features (internal consistency, use easiness, good definition of categories) and being widely accepted. The DSM-IV( APA, 1994) and ICD-10 ( WHO, 1993) provide diagnostic criteria for autism and related disorders such as Asperger syndrome (AS), Rett’s, and childhood disintegrative disorder. Pervasive Developmental Disorders (PDD), also called Autism Spectrum Disorders (ASD), are defined in terms of abnormalities in social and communication development in the presence of marked repetitive behaviour and narrow interests ( APA, 1994).
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