Discuss the various stages involved in decision-making as suggested by Wallas?

Wallas proposed a four-stage model of decision-making, which includes preparation, incubation, illumination, and verification. In the preparation stage, individuals gather information and define the problem. The incubation stage involves subconscious processing of the information, allowing ideas to develop. Illumination occurs when a solution or insight emerges, followed by the verification stage, where the proposed solution is tested and evaluated for effectiveness.