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=== Fix and test ===
After the fix has been applied, it is important to test the system and determine that the fix handles the former problem correctly.  Testing should be done for two purposes: (1) does the fix now handle the original problem correctly, and (2) make sure the fix hasn't created any undesirable side effects.

For large systems, it is a good idea to have [[:w:Software testing|regression tests]], a series of test runs that exercise the system.  After significant changes and/or bug fixes, these  tests can be repeated at any time to verify that the system still executes as expected.  As new features are added, additional tests can be included in the test suite.

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