Before the first day of school, I make up seating charts for each class period in alphabetical order keeping the seating boy/girl as much as possible. Instead of having the students stand up while I call out their seat, I place an index card on each desk. The cards list the period number and the student assigned to that particular desk. I write the directions on the board asking them to find their card and I greet the students as they enter the room. They know I mean business when they enter and we don't have to waste time assigning seats. This procedure also helps me learn their names fast as they are sitting in alphabetical order.