Documentation relating to the success/failure of one system over another? That would be useless information. Many systems you don't even get to, Stamp among them, are designed to be flexible based upon the students needs and musical desires. If a student's desire isn't to play a double C, documentation might indicated that there was a failure. Does Michael Sachs fail, Gozzo, Glow, Audino? They didn't play up there, they just played magnificently. I don't get the point of your laundry list. For every system, there are hundreds of way to tailor it to hundreds of students.