Incompatibility of Names
	v A problem with names … Procedure Assumes     Quantity      GUI Assumes heightIN              height          BMIheight weightLBS              weight          BMIweight bodyMass              bmi          BMIndex v Though in this case better communication might have saved this case, the need to associate different names is fundamental – it is essential in making procedures reusable.
			The procedure context must use a specific set of names for inputs and outputs, while the calling context will use other names for these quantities ... Parameters associate the names in each context