I just started using WebWork for my calculus classes. I have noticed that I can print paper versions (i.e., I can create a pdf file) of the homework sets I assigned, and this can be done for each individual student as well. I can also decide to show on the pdf file not only the problems, but also the correct answers/solutions. However, there is no way I can see on the answers the student gave on the same pdf file. If I want to know what the student entered, I need to do it problem-by-problem, but I guess you'd agree that having such a printout of all the answers of a student "at a glance" could be very helpful. For example, when (s)he comes to my office hours, or simply for me to grade it manually, write down my comments on it and then return it to the student.