Riker (possibly Chakotay as well, but I don't recall) seemed to be in charge of assessing how well crewmembers were functioning. On a big ship like the Enterprise D, I could see that taking up a good amount of time.
Actually, strangely enough, Seven of Nine did that job on Voyager. Look no further than the episode Good Shepherd. It should have been Chakotay's job, but apparently wasn't.