POB
The progress card system was well established on all the VGS that I ever taught at.
Usually there were boxes for 'attempts' by the student, once judged 'proficient' at the Ex it was signed off. It was revisited as part of the ongoing training and ultimately as part of the solo check. It certainly gave instructors a continuity check for students.
There was also a space for 'comments' as a I recall, which gave some feeling for the students ability......................
All part of the built in safety mechanism.
Arc
Edit: I think actually it was box scores 1 through 5 with 1 being 'low' and 5 'satisfactory'