Question: Please give some advice for stress testing versus load testing; function testing versus performance testing; and load testing versus performance testing.

Chuck Kelley's Answer: I am not sure what you are looking for. When you develop code, you MUST do unit (or functional) testing. Just because the data is written to the target does not make it right. Make sure your test cases covers all the different paths of your code. Next, you integrate all the developed code (usually called system integration). Then you MUST do the entire unit testing (again) as well as some system testing of all the components. Next there is load testing. Load testing is making sure that you can load the expected volumes of data. Once this has passed, then you do performance testing. Does you code execute within the time limits required. Where are any performance bottlenecks? Try to fix those. Lastly, there is stress testing. Stress testing puts a heavy burden on your system to see if there are any "stress" points.

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