Applied behavior analysis (ABA) is designed to increase social communication and other functional skills. There is a strong research base supporting the effectiveness of ABA for individuals with ASD to improve a variety of developmental skills. In 1999, the United States Surgeon General stated that ABA was the most proven treatment method for autism. Treatment may vary in intensity or duration, the complexity and range of treatment goals and the extent of direct treatment provided. Determination of the specific number of hours needed per week should be based on a comprehensive assessment by a Board Certified Behavior Analyst.