Which social psychology researcher said "There is nothing so practical as a good theory."

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Kurt Lewin is credited with saying "There is nothing so practical as a good theory." This statement emphasizes the importance of developing theories that can be applied to real-world situations and problems. Lewin's work focused on the practical application of social psychology to real-world problems, such as prejudice and group dynamics.

Which Social Psychology Researcher Said "There Is Nothing So Practical