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.
- http://www.gillettechildrens.org/default.cfm?PID=1.7.8.1&inq_key=14583&action=detail&LibID=211

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]
- http://www.aan.com/professionals/practice/pdfs/gl0063.pdf

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.
- http://www.altonweb.com/cs/downsyndrome/index4.html?page=autism.html

Autism Checklist
- Evaluating and diagnosing Autism/PDD, suggested medical tests.
- http://www.autism-pdd.net/checklist.html

Diagnostic Instruments
- Descriptions, with references, of the diagnostic instruments used at the University of Michigan Autism and Communications Disorders Center.
- http://www.umich.edu/~umacc/diagnostic_instruments/description.htm

Autistic Disorder: European Description
- The ICD-10 Classification of Mental and Behavioural Disorders. World Health Organization, Geneva, 1992.
- http://www.mentalhealth.com/icd/p22-ch06.html

CARD Factsheets
- Definition of autism, diagnosis and evaluation. [English, Spanish]
- http://card-usf.fmhi.usf.edu/cardpubs/factsheets.htm

Asperger's Disorder
- DSM IV diagnostic criteria for this condition.
- http://web.syr.edu/~rjkopp/data/as_diag_list.html

Pervasive Developmental Disorders
- NICHCY briefing paper, discussing how Pervasive Developmental Disorder Not Otherwise Specified (PDD-NOS) fits into the category of Pervasive Developmental Disorders.
- http://www.nichcy.org/pubs/factshe/fs20txt.htm

Autism, Asperger's Syndrome and Semantic-Pragmatic Disorder
- Paper on defining the boundaries.
- http://www.mugsy.org/bishop.htm

Development of Tools for Earlier Diagnosis of Autism
- Article from the APA Monitor.
- http://www.apa.org/monitor/nov98/autism.html

Assessment References
- Bibliography of professional resources.
- http://www.behavior-consultant.com/aut-dx-refs.htm