During my Education to Electrical Technician ("Lehre") in Switzerland we had a lot of exercises to learn debugging. One was that we got a blackbox with some pin

During my Education to Electrical Technician ("Lehre") in Switzerland we had a lot of exercises to learn debugging. One was that we got a blackbox with some pins and some maximum ratings and we had to find out what circuit is inside. Or we got a Circuit with a defined function and had to find out if it works as expected or not. And so on. This was also a big part of our exams. Then on the University the education shifted to a very theoretical approach.