When I first started teaching music, I required my students to write down the number of minutes they practiced each day and to have a parent sign it every week.
The problem was that I was trying to quantify my students' musical progress in to numbers of minutes. So, I decided to move away from my time-based system and shift to a more freeing, results-based practicing system with students that - coupled with a motivational approach to teaching - encourages autonomy, efficiency, and continual musical progress. It's a simple system that has been a dramatic success with my students. Here it is...