Which estimation technique uses Work Breakdown Structure (WBS) to estimate deliverables?

The choice of bottom-up estimation as the correct answer reflects the technique's reliance on the Work Breakdown Structure (WBS) for developing detailed estimates of project deliverables. This approach involves breaking down a project into smaller, more manageable components or tasks, which are organized within the WBS. Each of these smaller tasks can be estimated individually in terms of resources, time, and cost. By aggregating these detailed estimates, the overall project cost and timeline can be calculated with greater accuracy.

Bottom-up estimation is particularly effective when a project is complex or new, as it allows for careful consideration of each element of the work required. This methodology contributes to a clear understanding of the project requirements and helps in identifying potential risks or challenges at a granular level.

In contrast, other estimation techniques, such as critical path estimation, focus on the relationships between tasks and the sequence of activities rather than the specifics of work components found in WBS. Top-down estimation involves making high-level estimates based on overall project parameters without breaking the work into detailed components. Analogous estimation relies on historical data from similar projects and does not utilize WBS as a foundation for the estimates, thus making bottom-up estimation the most appropriate choice for utilizing WBS to estimate deliverables.