The National Professional Development Center on ASD developed foundational information on Autism Spectrum Disorders including recommended and evidence-based practices for early identification and diagnosis, as well as for intervention and education. The topics covered in this online course include Understanding PDD and ASD, Characteristics of Individuals with ASD, Assessment for ASD, Guiding Principles, Factors that Affect Learning and Development, Instructional Strategies and Learning Environments, Foundations of Communication and Social Interventions, Promoting Positive Behavior and Reducing Interfering Behaviors.