As teachers address the changes in how they teach, they do not have the same models on which to rely. Nothing can be taken for granted. Problem sets no longer provide the type of practice that is needed. Old tests and exams become outmoded. Tutors and parents may not be equipped to serve as resources.
Instruction has to be resequenced, with some old favorite topics and activities giving way to new.
The things that we were good at, that were comfortable, may no longer have a place in the reform classroom. Change becomes more difficult when there is little to model after. When you go on a journey, even if you are in unfamiliar territory, you can make progress if you have a strong detailed map with well defined landmarks. When you go into uncharted territory, you need to take with you a strong sense of direction or you may lose your way, and a strong sense of resolve or you will become discouraged and give up. The Pinellas County School System in Florida has a metaphor for change that is useful.