According to Wallas, the solution to a problem begins to come into consciousness during:

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According to Wallas' model of the creative process, the solution to a problem begins to come into consciousness during the illumination stage. This stage follows preparation and incubation, during which the problem solver may gather information, ponder potential solutions, and allow the problem to simmer in their unconscious mind. Finally, during illumination, a sudden insight or understanding may arise that helps the individual to see the problem in a new way and identify a potential solution. Verification, the final stage in the model, involves testing and refining the idea to ensure its effectiveness.

According to Wallas, the Solution to a Problem Begins to Come