As an Instructor Trainer for several training agencies and a Dive Shop Owner, it becomes a catch 22 when promoting course. The class (training agencies) that I prefer to teach and the class the student request sometimes clashes. From a business stand point, making a dollar and training efficiently becomes an issue of ethics. Not saying that certain training agencies lack in training although they do to some extent, it is still a recreational market and you have to give the customer what he/she wants or lose a sale. Just my 2 cents worth. Now with that being said, most training agencies method of delivery is different but the information giving is the same. As long as standards for the training agency is followed, I would say most instructors have their own methods of teaching. Once again, I am just a layed back country boy who loves to dive, sometimes I pick simplicity over rational thought of making more money from the customer. Maybe that is why I stay so broke!!!!!!!