Hi Lorraine:
For me, I don't always pretest but when I decide to, it is because I find it necessary to determine how much pre-knowledge I'm about to cover the students already possess. If they're on top of most it, I can alter where my emphasis for the material will be. Or, if they test poorly, I can modify my lessons in order to cover all the material and assure all students will served.
Regards, Barry
