A lot of the time, substitute teachers do not do a very good job instructing the class. They are very disorganized and often confused with the lesson plan, so this would help for them to become more organized and follow a clear and simple lesson plan.
Keeping Track of Anchor Charts: Take a picture, print it and file it in a binder before taking the poster off the wall. Teacher and students can refer to the binder even if the anchor chart isn't on the wall. Brilliant.