Let’s look at the move method refactoring in detail, to illustrate what Dr. Jones knows about a typical refactoring.
	Suppose we decide that the miles per gallon of a vehicle is really a property of a vehicle, and not its engine, to reduce coupling.
	We refactor by moving the method to Vehicle, and leaving a skeleton method behind in Engine that delegates to the new location.
	What would Dr. Jones need to know to help me plan this refactoring?