Integral theory (Ken Wilber)
Integral theory, developed by Ken Wilber, is a synthetic metatheory aiming to unify a broad spectrum of theories and models within a singular conceptual framework. The basis is the concept of a 'spectrum of consciousness' that ranges from archaic consciousness to the highest form of spirit, depicting it as an evolutionary developmental model. This model incorporates stages of development as described in structural developmental stage theories, encompassing a variety of psychic and supernatural experiences, as well as models of spiritual growth.
In the advancement of his framework, Wilber introduced the AQAL (All Quadrants All Levels) model, which further expands the theory through a four-quadrant grid (interior-exterior and individual-collective). This grid integrates theories and models detailing the individual's psychological and spiritual development, collective shifts in consciousness, and levels or holons in neurological functioning and societal organisation. Integral theory aims to be a universal metatheory in which all academic disciplines, forms of knowledge, and experiences cohesively align.
Integral theory has found its primary audience within certain subcultures, with limited engagement from the broader academic community. The Integral Institute publishes the peer-reviewed Journal of Integral Theory and Practice, and SUNY Press has released a twelve books under the "SUNY series in Integral Theory."