Get your new private voice students and parents started off right with this Practice Contract for Voice Students.
This is a great outline for beginning students and parents new to private voice lessons about how to establish a good at home practice schedule and routine.
It outlines good basic practice tips and gives specifics for responsibilities of student, parent and teacher. You can use this per semester or as needed in any situation as you can fill in your own specific expectations and lengths of time for the contract.
Some of my most successful students were saved by this simple "contract" when parents were at their wits end about how to get new students to practice.
Try it for some of yours and see if it helps!