DIR is the Developmental, Individual-differences, & Relationship-based model (pronounced saying each letter as an initialism: D.I.R.). It was developed by Dr. Stanley Greenspan to provide a foundational framework for understanding human development. It is based on the critical role of social-emotional development starting at birth and continuing throughout the lifespan. It also provides a framework for understanding how each person individually perceives and interacts with the world differently. The model highlights the power of relationships and emotional connections to fuel development. There is some controversy if it has met all the criteria for evidence-based. DIR is also referred to as DIR/Play Therapy/Floortime).