Parallel development occurs whenever a software development project requires separate development efforts on related code bases. For example, when a software product is shipped to customers, a product development team may begin working on a new major feature release of the product, while a product maintenance team may work on defect corrections and customer patch releases of the shipped product. Both teams begin work from the same code base, but the code necessarily diverges. Frequently the code bases used in parallel development efforts must be merged at some future date, for example, to ensure that the defect corrections provided by the product maintenance team are integrated into the major release that the product development team is working on.

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