See that's part of the problem I have. Most of the MBU's I have seen offered in our area tend to be start to finish. As long as they did their prereq they come back with a completed blue card ready to receive their badge.
I agree that there can be a benefit when you use an industry expert to provide a unique learning experience the Scouts would not normally get otherwise but unless there is a certified MB counselor there to A)test them individually and B) sign off on what they actually accomplished then it is nice but not productive. If you come away from a single day of an experience wit