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vertical incremental testing
subject			fact

vertical incremental testing	is a subtopic of 10.9 - Strategies for Testing Large Systems
	is a kind of 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	can find defects whose consequences are obvious but which are buried in complex code, and thus will be hard to detect when inspecting
	involves thinking of what could go wrong without actually studying the software
	requires attention to detail
process	see also process^2

Kinds of vertical incremental testing :

• bottom-up testing (5 facts) - A incremental testing strategy in which you start by testing the very lowest levels of the software using drivers, and then work upwards, as you integrate successive layers
• sandwich testing (7 facts) (mixed testing) - An incremental testing strategy in which you test the top layers and bottom layers, and finally test the integrated system
• top-down testing (6 facts) - 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