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This model was presented by Graham Wallas in his book Art of Thought, 1926. It was one of the first models of the creative process ever created. The model consists of 5 stages:
preparation: preparatory work on a problem that focuses the individual’s mind on the problem and explores the problem’s dimensions
incubation: where the problem is internalized into the unconscious mind and nothing appears externally to be happening
intimation: the creative person gets a “feeling” that a solution is on its way
illumination or insight: where the creative idea bursts forth from its preconscious processing into conscious awareness
verification: where the idea is consciously verified, elaborated, and then applied