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abstract operation
subject			fact

abstract operation	has definition An operation in a class that makes logical sense for all subclasses, but that is not implemented in the class
	is a subtopic of 2.6 - The Effect of Inheritance Hierarchies on Polymorphism and Variable Declarations
	is a kind of operation
operation	carries out a responsibility of a class
	is implemented as a set of methods
	is used to discuss and specify a type of behaviour, independently of any code which implements that behaviour
procedural abstraction	has advantage when using a certain procedure, a programmer does not need to worry about all the details of how it performs its computations; he or she only needs to know how to call it and what it computes
	hides the details of procedures