I just completed doing a physics lecture, one on physiology, one on basic deco theory, and one on dive safety procedures. I had to research and prepare these as part of my crossover to YMCA DM/AI. There are other subjects covered where lectures where done by the other two in my class. We then share these and augment with the manual to be sure standards are met. The purpose of these was to prepare a lesson plan for an OPEN WATER course where all of this would be covered. Basically the ow course as we teach it thru the shop I'm doing this with has a minimum of 7 lecture sessions, 8-10 hours in the pool depending of course on class size and how fast students progress, followed by their checkout dives. I'm taking my "Y" instructor course in may. In the meantime I've been assisting with classes, lectures, pool sessions, and checkouts. I'm also a certified PADI DM. The difference is striking between the 2 agencies in terms of requirements and standards. It's why I'm going with the YMCA program. Materials are less expensive but if properly taught just as good. It forces instructors to hold themselves to a higher standard. There is more flexibility as to when things can be taught which IMO is a real plus. We also incorporate more rescue skills. And though I've yet ot see anyone fail I have seen several that needed to repeat portions and one who was held up because his parents wanted him to go on vacation and the instructor would not issue a card because some skills had not been completed. His mom was pissed but the instructor told her how much needed to be done, how much time it would take, and she scheduled other things when he should have been in class. Her assurances that he would do them when he got back fell on deaf ears. I'm also awaiting my instructor materials to look into the YMCA silver and gold diver programs. They sound more like what and advanced class should be. Maybe Walter can furnish some details?