Activities in a project are discussed in a Work Breakdown Structure (WBS) session during the planning phase. Team members inform the project manager that whilst estimating the duration for activities, a lot of data exist about the effort required for each of them. Which estimation technique is best considered?
When a lot of data exist about the effort required for project activities, the bottom-up estimation technique (D) is most appropriate. This method involves estimating the effort for each task in the Work Breakdown Structure (WBS) individually, then aggregating them to derive the total project duration or cost. It leverages detailed data for accuracy, as per PMBOK's estimation techniques.
Top-down (A): Uses high-level estimates based on historical data or expert judgment, less accurate with detailed task data available.
Three-point (B): Uses optimistic, pessimistic, and most likely estimates for uncertainty, but is less focused on leveraging detailed effort data.
Comparative (C): Likely refers to analogous estimation, which relies on comparisons to past projects, not detailed task data.
Bottom-up estimation is ideal when detailed effort data is available, ensuring precision in project planning.