Thanks guys, all good suggestions!
Tigs: I hear what you say, but I've been asked specifically to give an aviation perspective - that said, I don't want to bombard them with terminology that they won't understand, any more than I would appreciate being lectured by doctors about how to use operating theatre techniques in the cockpit!
The "crossover" bit is what makes it difficult (and interesting) - hence my questions to you all.
thanks again everyone, keep 'em coming!
SW