Software Engineering

4.3.2 
Product breakdown structure
The product breakdown structure (PBS) represents the decomposition of the soft-
ware product into software configuration items, multiple levels of structural com-
ponents, and structural units. The PBS is essential since it provides the basis for 
software component integration and testing, as well as the refinement of work pack-
ages and budget allocations. However, the initial PBS can only address the top level 
of known configuration items and software components. The initial PBS becomes 
increasingly accurate as a result of developing the software product architecture.

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