Back to a solid grounding in the basics and a day to day operation that maintains those skills. This is not so simple as go to the sim, try it, and remember it incase it ever happens to you. You can not think of every scenario that the real world can throw at you and make a training program to cover them all. Impossible; but you can ensure your crews have a thorough grounding in a/c basics and should therefore be able to handle most scenarios. This thorough grounding can be encouraged in their daily routines and not discouraged as is often now the case.