main characteristics of Autistic Disorder

What are the main characteristics of Autistic Disorder?

What are the diagnostic criteria?

What type of accommodations can typically be found in elementary and middle school educational settings to help students with autistic cognitive and language impairments?
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Kindly mark 5/5 for my 400 words of notes and references:

As you describe the main characteristics of Autistic Disorder, it is marked by “severe deficits in socialisation, communication, and repetitive or unusual behaviours” (http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2863325/pdf/nihms196323.pdf). It is also deemed as a neurodevelopmental disorder and also characterized by impaired socialization.

One of my friends has a son with it. While he is highly intelligent, he exhibits problems with his social interactions and communication skills.

Research also reveals how symptoms “usually start before age three and can cause delays or problems in many different skills that develop from infancy to adulthood” (http://www.nichd.nih.gov/health/topics/asd.cfm).

The main signs and symptoms of autism are as follows:
? “Communication – both verbal (spoken) and non-verbal (unspoken, such as pointing, eye contact, and smiling)
? Social – such as sharing emotions, understanding how others think and feel, and holding a conversation
? Routines or repetitive behaviors (also called stereotyped …