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Nearly all persons supported by Community Systems, Inc. (CSI), approximately 500 persons, have developmental disabilities.

Developmental disabilities are, by definition, acquired before one's 18th birthday. According to the federal government's definition, a developmental disability is a severe, chronic disability which:

In brief, mental retardation (now termed intellectual disability in Europe, a term which is also gaining acceptance in the United States ) is a developmental disability.

A developmental disability may present in one or more of several ways and that, in turn, requires that CSI staff have special skills.