So what would your (hypo)thesis be? And what sort of manipulation would you perform to determine whether it is causation or correlation?
I am reminded of the reports I've read (Sioux City, I'm thinking of you...) where having someone in the jumpseat was of benefit when things went awry... and then there are other reports where you wonder whether a third pair of eyes would have caught the chain earlier...
With all the on-line databases, frequency numbers should be fairly easy (thought time consuming) to compile... it will be interesting to see what you come up with!
Boy I sound like a pompous ass... don't mean to... if you need a research collaborator drop me a PM.