Answer:
mystery shoppers.
Explanation:
Mystery shoppers are the people that companies paid to pose as an 'outsiders' to try their own goods or services.
Typically, mystery owners is hired by a stakeholder of the company in order to evaluate the business performance. The stakeholder wouldn't tell the employees that the evaluation is happening because to find out the employees' actual behavior.
The mystery shoppers will write a report after their evaluation and give it back to the stakeholder. The stakeholder will use this information to make decision about the employees in the future.
