A project manager has been asked for performance feedback regarding one of the team members...

The project manager should determine the appropriate approach for evaluating employee performance1. This involves establishing a framework for performance measurement that is tailored to the unique characteristics of project management1. This could include metrics such as task accountability, team member influence, and decision-making authority1. However, it’s important to note that these metrics should be used in conjunction with other forms of feedback, such as input from the project team and stakeholders21. This comprehensive approach ensures a more accurate and holistic assessment of employee performance1. References: 

https://www.coursera.org/articles/project-management-lifecycle