Answer:
unity of command
Step-by-step explanation:
The chain of command is a management concept that comes directly from the military. The principle of unity of command establishes that an employee will only report to one supervisor or manager, and only follow the orders of that supervisor or manager. This is done to avoid conflicts that may appear when an employee receives conflicting orders from more than one supervisor or manager.
E.g. supervisor 1 tells John to unload some boxes, while supervisor 2 tells him to clean the isle. John cannot do both things at the same time, so he will only be able to obey one supervisor.