git-r-dun diver,
I'm not familiar enough with the NAUI system to speak about the requirements for AOW, but SSI has a training and/or minimum logged dive requirement for each level or specialty. The feeling is that a diver needs to dive to get better and more comfortable with the skills he/she learned at one level before proceeding to the next. As far as swapping between agencies (or holding multiple agency certs.) - SSI will allow it as long as you have met the prerequisite training and diving requirements that students under the SSI system must meet. Check out www.ssiusa.com for the course requirements and descriptions. Lastly, don't let what others say scare you away from a class. Go to the shop, talk to the instructors and ask questions. There is no substitute for face-to-face conversations about diving instruction.
Good luck!
I'm not familiar enough with the NAUI system to speak about the requirements for AOW, but SSI has a training and/or minimum logged dive requirement for each level or specialty. The feeling is that a diver needs to dive to get better and more comfortable with the skills he/she learned at one level before proceeding to the next. As far as swapping between agencies (or holding multiple agency certs.) - SSI will allow it as long as you have met the prerequisite training and diving requirements that students under the SSI system must meet. Check out www.ssiusa.com for the course requirements and descriptions. Lastly, don't let what others say scare you away from a class. Go to the shop, talk to the instructors and ask questions. There is no substitute for face-to-face conversations about diving instruction.
Good luck!