I'm in a very similar situation to you Hudd1. Except with the added twist that I'm the new teacher and the colleague in question is supposedly more experienced than me. We each have an A-level and a BTEC group. The BTEC group he has were my students last year, and they're struggling, wanting me to mark and grade their coursework because he is very far behind (something like six weeks). The A-level students were given about 1/3 of the work they needed to cover before their mock exam as reading five days before sitting the mock, and he didn't mark the mocks until two months afterwards (I'd done mine by the next lesson I had with my group). I have informally spoken to my line manager, but to my knowledge my LM is not taking any action. He is reluctant for me to make a formal complaint (possibly because it then means work, forms, interviews etc). At the moment I'm trying to get the STUDENTS to bring complaints to their class reps, rather than having them b1tching to me about it. I'm probably on the brink of being asked by all the A-level students to read and mark their coursework - not sure I have the time or energy to do that really. I guess both of us are in this awful dilemma - the only way to make management see sense is for an entire class to perform abysmally. But the students do not deserve to be sacrificed like this to make a point. I'm trying to keep as good a set of notes about incidents that give me cause for concern. I don't know if that might help - it can then be added to the complaint of someone directly affected by this tutor, perhaps?