Autism spectrum also defined as autism spectrum disorder (ASD) is a range of mental disorders of the neurodevelopmental type. It includes autism and Asperger syndrome. Individuals on the autistic spectrum often experience difficulties with social communication and interaction and may exhibit restricted, repetitive patterns of behavior, interests or activities. Symptoms are typically identified between one and two years of age. Long-term problems may include difficulties in performing daily tasks, creating and keeping relationships, and maintaining a job.