Hi Bindu: Back up plans can be very useful for when what you have planned goes awry. It's bound to happen to even the best prepared teachers somewhere along the line. The key to devloping good backup plans is to assess what resources you can always count on even in the worst of situations, such as the computer lab is down, copier broken, textbook resources absent, etc. Even running out of dry erase markers can be "bad-day" enforcer unless we plan for the worst. Hope your need for back up plans are few and far between. Regards, Barry