In general, why is it NOT a good idea to estimate the testing effort based only on a percentage of development effort? Identify THREE valid reasons. 1 credit
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The quality of the development estimate may be poor.
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In general bottom-up estimation is always better than top-down estimation.
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The percentage based technique only applies to the V life cycle model.
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Using the same percentage every time does not address the level of risk of the application to be tested.
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The maturity of the organization, e.g. the quality of the test basis, quality of development testing, configuration management, availability of test tools, also influence the effort needed for testing.
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It builds on large set of historical data
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The result is almost always a too low estimate for the required test effort