Level 3 autism is the most severe form of autism spectrum disorder (ASD) and requires substantial support in many areas of life: COMMUNICATION -People with level 3 autism have significant deficits in verbal and nonverbal communication skills. They may have limited speech or no interest in social interaction. SOCIAL INTERACTION - People with level 3 autism may have a limited ability to initiate social interactions or respond to others. They may avoid social situations or only interact with others