Graham Wallas devised a fourfold for stages of creativity:

• Preparation
• Incubation
• Illumination
• Verification

From the “Art of Thought” description on Amazon:

“The first in time I shall call Preparation, the stage during which the problem was ‘investigated … in all directions’; the second is the stage during which he was not consciously thinking about the problem, which I shall call Incubation; the third, consisting of the appearance of the ‘happy idea’ together with the psychological events which immediately preceded and accompanied that appearance, I shall call Illumination. And I shall add a fourth stage, of Verification …”

Further Reading:

The Art of Thought: A Pioneering 1926 Model of the Four Stages of Creativity

https://en.wikipedia.org/wiki/Graham_Wallas

http://members.optusnet.com.au/charles57/Creative/Brain/wallis_intro.htm

http://members.optusnet.com.au/charles57/Creative/Brain/wallis.htm

http://members.optusnet.com.au/charles57/Creative/index2.html

http://agileotter.blogspot.com/2013/05/wallas-four-stages-of-creative-thought.html

Turning ideas into reality: the four stages of creativity

Graham Wallas / The Art of Thought

Albert Rothenberg, Carl R. Husman, eds. / The Creativity Question

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