According to Ellis (1973), play fosters the behavioral variability of an individual, and therefore a species. This increases the probability of future adaptations to unpredictable circumstances where behavioral flexibility is an advantage.
Today, leaders in theories of early childhood education see play as fostering well-being, creative thinking skills and cognitive development. As the child plays, all facets of development are enhanced. Motor, cognitive and socio-emotional development are all increased as the child participates in play experiences. As the children engage in play, the need for variety and competence all come into focus. (Frost & Sunderlin 1985).