About Action Behavior Centers - ABA Therapy for Autism Our ABA Therapy Center in Longmont, CO, Action Behavior Centers – Autism Therapy and ADOS testing in Hygiene, Niwot, Mead, Puritan, Leyner. Our Longmont ABA Therapy center provides services for early learners, school-age children, and teens on the Autism Spectrum. Applied Behavior Analysis (ABA) therapy is the leading treatment method to improve the signs and symptoms associated with Autism Spectrum Disorder (ASD).