I feel as a instructor that school and class policies and enforcement of those policies is a must in any class room enviroment. I also think that if you cover in detail what is expected of the students on the first day of class and what the possible out come may be if policies are not followed, helps with class control there after. If you include your students in the discussion and possible affects if no rule's were in place at all,they come to the conclusion that rules are inplace for a reason and are more willing to comply.This helps with not only class control but with creating a learning atmosphere where the students feel that they have a say in their education process. Policies are there to help not only the instructor but to help the student as well, and by showing them they have a say goes a long way.