Brooks's Law: Adding manpower to a late software project makes it later.
The bearing of a child takes nine months, no matter how many women are assigned.
The essential prerequisite for building an expert system is to have an expert.
Thinkers are rare; doers are rarer; and thinker-doers are rarest.
When schedule slippage is recognized, the natural (and traditional) response is to add manpower. Like dousing a fire with gasoline, this makes matters worse, much worse.