Using an employee's manager for feedback is very useful because managers' own success depends so much on their employees' performance.

Managers

Individuals responsible for directing and overseeing the work of a group of people in an organization.

Performance

The act of carrying out or accomplishing tasks and duties, often measured against a set of standards or goals.

Feedback

Involves providing information or opinions about someone's performance or work, aiming to reinforce strengths or identify areas for improvement.