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top-down testing
subject			fact

top-down testing	has definition An incremental testing strategy in which you start by testing only the user interface, with the underlying functionality simulated by stubs, then you work downwards, integrating lower and lower layers
	finds defects in the layer that was most recently integrated
	has disadvantage the cost of writing the stubs
	has procedure test only the user interface, with the underlying functionality simulated by stubs work downwards, integrating lower and lower layers, each time creating stubs for the layers that remain un-integrated as you integrate each lower layer, test the system again
	is a subtopic of 10.9 - Strategies for Testing Large Systems
	is a kind of vertical incremental testing
integration testing	has advantage when you find a problem, you can find the defect more easily because you have a better idea in which subsystem to look
	is better than big bang testing for large systems
testing	involves thinking of what could go wrong without actually studying the software
	requires attention to detail
process	see also process^2