The American Academy of Pediatrics recommends evidence-based parent and/or teacher behavioral therapy and/or medication to treat ADHD. A systematic review by Coates and colleagues found behavioral interventions decreased ADHD behaviors in children. The NHA is an intervention designed to teach parents a set of skills and attitudes to decrease ADHD in children. It has been applied in a number of settings from homes, schools, and foster care agencies both in several states in the U.S. and in over 16 countries. While widely accepted, the Approach has not been evaluated using scientifically rigorous methods.