The term "integration" (or "integrating") refers to any efforts still required, after individual programmers, or sub-groups of programmers working on separate components, for a project team to deliver a product suitable for release as a functional whole.

For instance, if two developers, working in parallel, implement new features on two components A and B, and each thinks to their own satisfaction that the work is complete, then verifying that changes to A and B are consistent, and resolving any inconsistencies, belong in the category of integration.

Integration is often required at different levels: individual developers may work on components integrated into subsystems, which are in turn integrated with other teams' subsystems to form a larger system, and so on.

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