Hmmm... I guess it doesn't impact my job in a major way. It does in a minor sense, like I have to manage and direct her students to the right space in the gym because she isn't there to do it herself. But that's certainly not a major inconvenience, and it doesn't prevent me from doing the same with my own students in any major sense. So, no, it's not severe enough that I feel I need to tell somebody. I think it would only make me look bad by tattling. I guess it matters to me because I'm frustrated with the fact that I have to cut out things from my morning routine, things that I would like to do but know that I don't have time to do, in order to be in that room on time. It's frustrating that she can get away with it so frequently simply because the administrators aren't there to see it (they won't deal with it because they don't know it's happening) and she knows that everyone else will supervise her students for her because it really isn't a big deal to do so. I make a concerted effort to be there on time because it's my job to do so. If it's so easy to get away with, maybe the rest of us should start being late, too... but then what happens? Then no one would be in the room to supervise the kids. I have no problem with someone being late on a rare occasion, nor do I have a problem with someone being there on time but asking a colleague to supervise the students while that person goes to run an errand or use the restroom. I do have a problem with the same person being habitually and intentionally late because she is taking advantage of her colleagues' goodwill and her administrators' lack of presence.