Flow theory, conceptualized by the psychologist Mihaly Csikszentmihalyi, describes the subjective state of full engagement and deep absorption in intrinsically-motivated activities. In flow, individuals feel they are merging with what they are doing and lose track of time--colloquially referred to as "being in the zone"--which creates sense of fulfillment. Since its introduction, flow has been widely studied and is recognized as an optimal experience that accompanies performing at one's best. Flow Theory Re-Envisioned provides a comprehensive analysis of flow theory, examining its foundations, demonstrating its relevance to a range of psychological concepts, addressing its critiques, and offering recommendations for strengthening the research methodologies used for studying flow. The volume explores the necessary and sufficient conditions for generating flow, the variety of ways in which it is experienced, the psychological functions it serves, the autotelic personality, and the balance between automaticity and focused attention during flow events. This extensive resource concludes with a discussion of the role of flow in a life well-lived.