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What is the difference between bottom-up and top-down approaches?

April 26, 2017approaches bottom-up difference top-down

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What is the difference between bottom-up and top-down approaches?

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Bottom-up approach: In this approach testing is conducted from sub module to main module, if the main module is not developed a temporary program called DRIVERS is used to simulate the main module. Top-down approach: In this approach testing is conducted from main module to sub module. if the sub module is not developed a temporary program called STUB is used for simulate the submodule.