A "top-down" approach to creating a WBS is typically used when a project is unique and different from previous projects.

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A "top-down" approach to creating a Work Breakdown Structure (WBS) is generally used when the overall project is well understood but the details are not, allowing for a hierarchical decomposition from general to more specific tasks. It does not necessarily relate to the project's uniqueness but rather to the clarity of the project's overall scope at the beginning.

A "Top-Down" Approach to Creating a WBS Is Typically Used