PERVASIVE DEVELOPMENTAL DISORDERS - DISTINGUISHING AMONG SUBTYPES

Pervasive developmental disorders (PDDs) are severe and pervasive cond itions that begin in early life and influence multiple areas of develo pment, In addition to the more commonly known autistic disorder, these conditions include Asperger's disorder, Rett's disorder, childhood di sintegrative disorder, and pervasive developmental disorder ''not othe rwise specified.'' Intensive behavioral intervention at an early age h as been documented to improve the developmental trajectory of many of these children, and this treatment is therefore essential from the pre school years on. The school psychologist has a vital role to play in d iagnosis, assessment, and classroom consultation for children with PDD s.