Asperger's Disorder: DSM IV diagnostic criteria for this condition.
Assessment References: Bibliography of professional resources.
Autism Checklist: Evaluating and diagnosing Autism/PDD, suggested medical tests.
Autism, Asperger's Syndrome and Semantic-Pragmatic Disorder: Paper on defining the boundaries.
Autistic Disorder: European Description: The ICD-10 Classification of Mental and Behavioural Disorders. World Health Organization, Geneva, 1992.
CARD Factsheets: Definition of autism, diagnosis and evaluation. [English, Spanish]
Development of Tools for Earlier Diagnosis of Autism: Article from the APA Monitor.
Developmental Delay vs. Developmental Disorder in Young Children: Understanding the Difference: Article on differentiating between the two conditions. Includes modified checklist for Autism in toddlers.
Diagnosis of Autism in Children With Down Syndrome by Glen Vatter: Detailed comparison of the symptoms of the two conditions, and a discussion of issues in diagnosis.
Diagnostic Instruments: Descriptions, with references, of the diagnostic instruments used at the University of Michigan Autism and Communications Disorders Center.
Pervasive Developmental Disorders: NICHCY briefing paper, discussing how Pervasive Developmental Disorder Not Otherwise Specified (PDD-NOS) fits into the category of Pervasive Developmental Disorders.
Practice Parameter: Screening and diagnosis of autism: Detailed discussion for physicians of the steps in autism diagnosis, with suggested medical tests and other assessments. From the American Academy of Neurology and the Child Neurology Society. [PDF file]