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comment What is the difference between waterfall model with iterations and evolutionary software development model?
+1 for the comparison with the engineering and scientific processes.
comment Is it ever justifiable to write code without tests when doing TDD?
This is a purely hypothetical situation, so any type of test you could justify as still living up to being the testing part of TDD. Of course unit tests are the most likely candidate.
comment Does software testing methodology rely on flawed data?
The cost vs. time of discovery would probably also be influenced by how clean the code is. If it is done right it might just be a simple and equally cheap thing to fix, but if the code-base is a mess it might require a lot more changes through the system which will be harder, more expensive to do the more places the effects of the bug could have gotten into, and take more time.