The process theory that seems to have been violated in this organization is the Job Characteristics Theory, which was created to analyze work outcomes, such as how work characteristics affect job satisfaction.
With the information contained in the question, it is clear that the characteristic that has affected the work of the new manager Justin is that he has felt overloaded at work.
The last three managers who held their position resigned after a few months, probably because they also felt overwhelmed, as there is information that managers deal with 27 direct reports.
Therefore, a strategy to increase job satisfaction would be to redesign the work, which:
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