I feel very strongly about this. If classes, meetings or events are scheduled for a specific time, they should start precisely at that time. Delaying them until the latecomers get there is rude to the people who made it a priority to be punctual. Also, once the habit establishes that classes begin late, more people will be late, and it becomes a vicious cycle.
If classes always start on time, the people who were late the first time will learn. If they don't, it's their problem. They should not be allowed to inconvenience anybody else.
As an instructor, I always start precisely on time, and in turn make sure I also finish exactly on time. It is a matter of professionalism and courtesy towards the participants who have other committments as well.
Edited by regentrude, 17 July 2017 - 11:32 AM.