Ideally, this linking is done automatically. While networking is possible to manually create and maintain links between project artifacts, the work involved is detailed and constant. Whenever a requirement or test case changes, links have to be networking manually reestablished. The effort needed to manually create and maintain links between requirements, test cases, and defects is excessive, especially if those links have to be examined and updated almost daily.
In most projects, testers execute test cases multiple times, in different test runs. Tests are rerun when an initialnet working run fails, and the fix needs to be verified. Tests are also run additional times for regression purposes, as the embedded software product scope grows to meet more requirements.
