117 behaviours, plus some pretty interesting analyses (registration required to read all of them but is free), and how to remedy them, and it seems pretty useful for newly-recruited TFA teachers shoved into a classroom and the like but have to deal with a few problem students who ruin it for everyone else eager to learn. The site breaks down each behaviour by "causes" or "needs" and suggests effective ways of remedy, and mistakes to avoid. In short, it suggests ways for a teacher to quickly gain control of a problematic situation, but in a subtle manner, without being unprofessional.
Teachers (or new talented ones at least) didn't join to be a Machiavellian, but perhaps for new teachers in some low-income districts it would be a necessary evil in order to be able to do the sort of thing they joined the corps for, infusing their students with passion and all of that. And many of the tips are rather insightful -- there are apparently promising ways to even make any troublemaker a potentially really productive student.
(-- and of course, I'm still a hopeful undergrad TFA applicant)