Howard Gardner's theory of multiple intelligences has helped many to rethink how to educate both children and adults.

Intelligence Reframed: Multiple Intelligences for the 21st Century
Howard Gardner - 1999

Finding Flow: The Psychology of Engagement with Everyday Life
Mihaly Csikszentmihalyi - reprint 1998

Beyond Boredom and Anxiety: Experiencing the Flow in Work and Play
Mihaly Csikszentmihalyi - 2000