This document provides an overview of Relationship Development Intervention (RDI), an autism treatment that focuses on developing dynamic intelligence. It defines autism as a spectrum disorder with varying symptoms that may include repetitive behaviors, poor social skills, unusual communication, and behavioral differences. RDI aims to address deficits in dynamic intelligence, which involves skills like problem-solving, flexibility, and emotional regulation, by re-establishing guided participation relationships between parents and children. Parents are trained to slow down, communicate in ways their child can understand, and challenge the child to think independently over time.