Log in to your PeopleMatter account and go to the PERFORM module. Go to the drop down menu to the right and pick Admin Tools>General>People. Click Edit next to the person's name and then the Evaluations tab. All evaluations will be listed there, along with the name of the rater, name of the form, date assigned and date completed.
You can also check by running a report. Go to Reports on the Evaluation home screen and you can search Complete and Incomplete Evaluations. Both will show the Team Member and Rater names.