The autism spectrum includes an incredibly wide range of people, with an amazingly broad range of abilities and challenges. So, what symptoms do all autistic people share?
It's important to note, too, that symptoms of autism can also be strengths. For example, a child on the autism spectrum may have better observational abilities than a typical child of the same age.
Sources:
Autism Society of America Website
Romanowski, Patricia et al. "The OASIS Guide to Asperger Syndrome." C 2000: Crown Publishers, New York, NY.
Autism Spectrum Disorders (Pervasive Developmental Disorders) National Institute of Mental Health, 2004.
Greenspan, Stanley. "The Child with Special Needs." C 1998: Perseus Books.

