Which strategies are most effective for maintaining order in the classroom?

There are many strategies for maintaining order in the classroom as we've read about and discussed through our courses thus far. There are many factors to take into account for "maintaining order" such as establishing your expectations for the class from day one, how you set up the room, if you're fair and consistent with "punishments", how you delegate and assign tasks, etc. It seems like the main things that help towards better classroom maintenance is expresing from the beginning your expectations and what could happen if these are not met, establishing and holding your status as the authority figure in the room (while also keeping a kind and approachable demeanor), and being consistent in the ways in which you deal with classroom issues. Is there any way to establish a firm set of methods in which classrooms will always be maintained, or does it change from year to year or even day to day depending on those in the classroom?