Project assessments are used to evaluate employee working on projects and feedback is given by a assessor who can be same as Project manager or a different person.

Refer to -
1. Setting up Project Assessment - to understand the setup options
2. Releasing Project Assessments - to understand how to release project assessment process as a Project manager
3. Project self assessment by employee - how to fill up the project assessment as an employee
4. Project feedback as assessor - how to provide project feedback as an assessor