I print out this chart for each class and will then color in the boxes and the class completes each level of the preparation for each piece. I have found it helps the class stay focused throughout the process. It will create a positive competition between the ensembles which increases productivity. The chart also gives a great visual to the fact that their is much to prepare in addition to notes and rhythms.
With my chorus class I will highlight the title at the bottom once the piece is memorized.