What is the most efficient way you do your lesson plans so you are not copying and pasting and shifting plans all around when a lesson takes more days than originally planned? For example, I made my plans for next week and realized I needed another day on a certain lesson because of a fire drill. so I had to shift each days plans and homework, which is really easy to mess up if I am not careful. Then I had to do it again for another lesson that the kids needed more time to understand. This is not efficient. There has to be a computer program that does the shifting for you. Does anyone use excel for lesson plans? Or anything else?