Teaching Strategy - work habits mark

My sponsor teacher has a particularly mis-guided grade 11/12 class. She decided part way through the semester that she would give them each a mark out of 3 for every class based on their work habits that day. She told them her plans and then implemented it right away. At the end of each class she would go around and tell the students what mark she gave them. Surprisingly, most students agreed that the mark she gave was accurate. Although my teacher can't put these marks into their grade, she can use them for reference when doing the G,S,I part of the report cards. Also, it made the students feel like their work habits were more important in the grading process and made them reflect on, at least momentarily, about how they behaved each class. I don't know if she has kept this up since October but I will be interested to know if it has helped the overall behavior since then.