Thank you for your reply. That is very interesting. Anyone at the dojang with a dark bluebelt or higher could teach class if the master was not available. Before we were issued a blackbelt we had to earn three white stripes on our dark bluebelts through teaching all the warmups, stretches, techniques and colored belt forms to the class. The majority of students quit before they got a "blackbelt" and a dan # and kukkiwon certification even if they had a dark bluebelt with stripes. I recently went to a new, local taekwondo school in the US after many years off and was quite surprised at the difference in everything. Their blackbelts start at one stripe instead of no stripes and they have no dan # on their belts. That is apart from the curriculum differences. I have found the Moo Duk Kwan Taekwondo curriculum very complete in comparison.