Parents argue a one-on-one therapy approach to autism is the best method available for toddlers, and are taking their fight for it to court for thousands of children in New York City preschools and elementaries.

Applied behavior analysis, which breaks up tasks into small steps and teaches skills through rewards and repetition, is “the most well-researched and validated general approach to treatment for (autism spectrum disorder),” officials from the state health department wrote. It’s administered frequently to 0-3-year-olds in the state’s early intervention system.

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