Each class needs to be planned and exercised in a logical and clear way. I usually have handouts and in-class assignmnets each class. I make it a point to have them printed and ready for distribution before each class. I also show videos and I make it point to have tvs or flashdrives etc. all organized before the class begins.
I think a little bit of planning goes a long way to show students how to be professional and that we care about their time and success.
