Employees of service centers spend much of their time working for other people in other organizations. To perform a review of such an employee, the line manager in the service center should talk with every manager for whom the employee has worked since the last review, and use that input in the evaluation. As with the annual review of the service center as a whole, if a single manager is disgruntled with the work of the employee, that should not spell disaster for the employee; indeed, if there are widely conflicting opinions about the employee's performance, this is an indication that something more complex is happening that needs to be investigated.