The approach is a management approach that advocates the idea that a manager's attitude toward employees can affect productivity; the self-fulfilling prophecy is an example.

Human Relations Approach

Explanation:

According to my research on studies conducted by various sociologists, I can say that based on the information provided within the question the approach being described is called the Human Relations Approach. Like mentioned in the question this approach refers to the view that the effectiveness of any organisation depends on the quality of relationships among the people working in the organisation.

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