According to the National Autistic Society, Autism Spectrum Disorders about one in every hundred people in the UK have an ASD. Autism Spectrum Disorders include conditions such as autism and Asperger syndrome. ‘Spectrum’ the word is used because the symptoms of ASD vary greatly in type and severity among those affected.

In general, children who have Autism Spectrum Disorders do not develop social and language skills than other children their age do. As a result, they find it difficult to relate to others. Children with ASD may also unusual behavior and learning problems.
Autism
Children with autism have difficulty communicating and interacting with others. This is often first noticed by two years of age. Some children with autism have learning difficulties such as dyslexia (a condition that the development of language-based skills such as reading difficult, spelling and writing). Autism is more common in boys than in girls.
Autism Spectrum Disorders For Asperger’s Syndrome
Asperger syndrome is similar to autism, but is generally less severe. Children with Asperger syndrome often communicate better than those with Autism Spectrum Disorders and average intelligence or above average. They usually do not have learning difficulties that children with autism.
The Autism Spectrum Disorders term (ASD) refers to the range that experts in people, according to the different properties that are autistic. The “low end” of the spectrum includes all the core features of autism. Meanwhile, the “high end” of Autism Spectrum Disorders has a completely socialized people whose behavior is almost completely “normal.”
The Funny Side of Autism [Paperback]
The Myth of Autism: How a Misunderstood Epidemic Is Destroying Our Children
Ten Things Every Child with Autism Wishes You Knew [Paperback]