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The subject selection and diagnostic techniques documented in the Journal of Autism and Developmental Disorders are summarized in this review. The researchers looked at 142 empirical studies published between February 1993 and April 1997. Using a coding instrument created by the authors, reviewers separately evaluated publications. The majority of researchers used one or more standard diagnostic criteria to categorize their individuals, according to the findings. However, several research failed to mention the methodology used to quantify or apply the diagnostic criteria. In addition, the inclusion and exclusion criteria for concomitant conditions were not clearly defined. Making improvements to the documentation of Researchers and practitioners will benefit from diagnostic procedures in autism research.