The different types of integration testing are big bang, top-down, bottom-up, and back bone.
Big Bang: In this approach, all or most of the developed modules are coupled together to form a complete software system or major part of the system
and then used for integration testing. The Big Bang method is very effective for saving time in the integration testing process. However, if the test cases
and their results are not recorded properly, the entire integration process will be more complicated and may prevent the testing team from achieving the
goal of integration testing.
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Bottom Up: All the bottom or low level modules, procedures or functions are integrated and then tested. After the integration testing of lower level integrated modules, the next level of
modules will be formed and can be used for integration testing. This approach is helpful only when all or most of the modules of the same development level are ready. This method also helps to
determine the levels of software developed and makes it easier to report testing progress in the form of a percentage.
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