Applied Behavior Analysis (ABA) is a research based best practice for autism interventions.  If you’re wanting to learn more about this technique (for free) then BAAM is the place to go.  ABA has lots of jargon that can make it difficult for parents and professionals to understand, but when you see it in action, it makes a lot more sense.  Well BAAM lets you see ABA in action by going to their movie index.