Sample interview questions: Can you explain the difference between bottom-up and top-down estimation methods?
Sample answer:
Bottom-Up Estimation:
- Approach: Breaks down the project into smaller tasks or work packages.
- Data Source: Detailed information about individual tasks, such as resources, duration, and costs.
- Accuracy: Can be highly accurate if task-level data is accurate and complete.
- Use Cases: Best suited for projects with well-defined tasks and deliverables.
Top-Down Estimation:
- Approach: Starts with a high-level understanding of the project as a whole.
- Data Source: Historical data, industry benchmarks, expert opinions, or analogous projects.
- Accuracy: Less precise than bottom-up, but provides a quick and early estimate.
- Use Cases: Useful for projects with limited information, high uncertainty, or a need for quick estimates.
Comparison:
| Aspect | Bottom-Up | Top-Down |
|—|—|—|
| Accuracy | High accuracy with detailed task-level data. | … Read full answer