Work Breakdown Structure - a hierarchical decomposition of project work into smaller, manageable components. It breaks complex projects into progressively detailed levels of tasks and deliverables.
Acronym developed by the U.S. Department of Defense in the 1960s for managing large defense projects. The concept evolved from systems engineering approaches to handle massive, complex undertakings.
The WBS is like a Russian nesting doll for projects - you keep breaking things down until you reach tasks that one person can complete in a reasonable time. The rule of thumb is that if you can't estimate how long something takes, you need to break it down further!
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