An incremental approach to integration testing where the lowest level components are tested first, and then used to facilitate the testing of higher level components. This process is repeated until the component at the top of the hierarchy is tested. See also integration testing.
In simple English:
Test one small piece at a time starting with the lowest level.
Field notes:
Most often this is the approach taken when both the development and testing are done by the same company.
This approach in principle is the basis of several other famous approach like test driven development, agile and that family of processes.
In some cases this approach might not be very appropriate.
For example:
when the property being tested it's an implementation of a established stable product like people soft, this approach makes no sense as all the components are already tested and proven.
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