Which theorist is responsible for identifying the Theory Z style of management?

Question

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Theory Z management style was first identified by William Ouchi in his book "Theory Z: How American Business Can Meet the Japanese Challenge". Douglas McGregor is known for his Theory X and Theory Y, Frederick Taylor is known for his Scientific Management approach, and Frederick Herzberg is known for his Two-Factor Theory of motivation in the workplace.

Which Theorist Is Responsible for Identifying the Theory Z Style