DSM is intended to serve as a practical, functional, and flexible guide for organizing information that can aid in the accurate diagnosis and treatment of mental disorders. It is a tool for clinicians, an essential educational resource for students and practitioners, and a reference for researchers in the field.”

A full pdf link can be found here DSM-5.

Here are the major changes from DSM 4 to DSM 5 in the area of autism:

• The APA has gotten rid of the sub-categories Pervasive Developmental Disorder (PDD), Rett’s Syndrome and Childhood disintegrative disorder and replaced it with Autism Spectrum Disorder (ASD).
• Another huge difference is that Asperger’s Syndrome has been removed from the DSM-5. It has been replaced with the term ASD level 1 without language or intellectual impairment. Most professionals are still referring to Asperger’s Syndrome in describing the disability because the term is widely used and understood in the general public.

• The new diagnostic criteria for ASD have been rearranged into two areas: 1) social communication/interaction, and 2) restricted and repetitive behaviors. The diagnosis will be based on symptoms, currently or by history, in these two areas.

• DSM-5 has also added a category under restricted, repetitive patterns of behavior, interest or activities called hyper or hypo-reactivity to sensory input or unusual interest in sensory aspects of the environment.

Symptoms must be present in early childhood but may not become fully manifest until social demands exceed capacities. Symptoms need to be functionally impairing and not better described by another DSM-5 diagnosis.

Symptom severity for each of the two areas of diagnostic criteria is now defined. It is based on the level of support required for those symptoms and reflects the impact of co-occurring specifier such as intellectual disabilities, language impairment, medical diagnoses and other behavioral health diagnoses.

The DSM-5 includes a new diagnostic category of Social Communication Disorder that describes children with social difficulty and pragmatic language differences that impact comprehension, production and awareness in conversation that is not caused by delayed cognition or other language delays. This diagnosis looks a lot like Asperger’s Syndrome to most professionals.