What is the theory behind it?

Many experts believe that children with autism are less likely than other children to learn from the everyday environment ⁽¹²⁾. The ABA approach attempts to fill this gap by providing teaching tools that focus on simplified instructional steps and consistent reinforcement. At best, the ABA approach can help children with autism lead more independent and socially active lives ⁽¹²⁾. Research suggests that this positive outcome is more common for children who have received early intervention. This may be due to critical brain development that occurs during the preschool years and can be affected by training ^{(3, 13)}.