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Walter:"how can results be improved?"
Pretty simple, actually.
Start by requiring people to swim. Next teach skin diving. Teach it with a real snorkel - a simple J. Skin divers should learn and master: mask clearing (3 times on one breath - minimum), no mask breathing, 5 styles of kicks, cramp removal, equalization, head first and feet first dives, ascents, mask and snorkel recovery from the pool bottom, breathing through a flooded snorkel, blast and displacement snorkel clearing, entries and exits, comminications, the buddy system, NO swimming with hands, and neutral weighting.
Once that is accomplished, introduce SCUBA. Get off the bottom!!!! Skills should be learned and practiced off the bottom. Eliminate fin pivots and work on true neutral buoyancy. Review many of the skin diving skills, equalization, neutral weighting, entries and exits,cramp removal, 5 styles of kicks, communications, the buddy system, no mask breathing, mask clearing, snorkel/regulator exchanges (and vice versa), 3 methods of regulator clearing, 2 methods of regulator recovery, neutral buoyancy, helicopter turns, weight belt removal and replace, oral inflation of BC, breathing from a free flowing regulator, disconnecting a stuck LPI, octopus breathing, buddy breathing, descents, ascents, ESA, Doff and Don, equipment exchange with buddy, bail out, equipment exchange with buddy while buddy breathing, rescue exhausted diver on surface, rescue panicked diver on the surface, rescue unconscious diver on the surface, and rescue unconscious diver off the bottom.
Practice. These skills aren't passed by doing it once. They must be mastered to the point the student can repeat them easily.