Third, when the supervisor’s planning ability was good, the stress level was low. The meaning of “planning” in this study means to organize and plan work well. In previous studies, there have been few study on the relationship between supervisors’ planning ability and job stress. However, there have been studies that have increased job stress when work overload has increased [25, 26]. Supervisors are in an important position to manage role stress. They can influence role overload by determining the scope of work of an employee, and can monitor the worker’s impact on a role. When workers experience quantitative overload, they can help workers by analyzing their work, providing training that helps them work, or introducing workers who do a similar job. Or to help workers who are experiencing quantitative overload by distributing part of the work to another worker or by putting in another worker . With these organizing or planning approaches, managers can reduce psychological strain by preventing worker overload .