"Andrew Gideon" wrote in message
online.com...
That's true, but it's one additional person that must make a mistake (or
lose awareness) for something bad to happen.

It's also one additional person who can make a mistake and create a
hazardous situation where none previously existed.

It's not a perfect solution, but it does improve the odds.

Are you sure? I've never seen any statistics that prove that a tower
"improves the odds". Due to the additional failure modes, it could just as
easily reduce the odds. There are lots of examples of where adding manpower
doesn't improve efficiency, quality, or safety. This might be one of them.

Pete