Hi Eileen: Back up plans come in in all shapes and sizes. There are those plans that are used when the resources you'eve planned for are not available for whatever reason (technology, overhead lightbuld, etc). Then, there's the plans for assuring the teacher has enough pertinent material to cover the duration of the class period. This pertains to too much and too little. Another kind of back up plan is when, through circumstances not your own, your whole lesson has to be changed to another day (guest speaker fails to appear, students are not ready to move forward, etc). The key is thougful planning, time and effort put into each class that will assure under any circumstance (short of a Katrina event) the students will receive a full and fair instructional period. Regards, Barry