The no zero concept is interesting to me because I have more than just a few students who outright refuse to do certain assignments. I have 2-5 students PER CLASS PERIOD who outright will not do homework... period. Even if given class time, study hall, whatever... they just won't. I've given extensions, spoken to them, provided class time to work, and some continue to just not do it. What's the solution to that? Harassing them (as noted above) does nothing, they don't really care. These kids have a goal in mind... "D-" ... "Passing". That's all. And even that goal isn't rock solid, because for the classes where "passing is too much work" they let themselves fail, and wait until the following semester or year for "an easier teacher" of the subject. Bleh.