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✅ Correct Answer: C. Review the completion costs of similar projects

• 📊 Agile projects use **progressive elaboration** — detailed estimates come later.
• 🧠 In early stages, **analogous estimating** is most appropriate — based on past similar efforts.
• 📑 This helps sponsors assess feasibility **before** backlog details are available.

✔ Why Option C is Correct

In Agile, early business case cost estimates rely on high-level comparisons to similar completed projects. This method provides reliable, fast input when detailed scope and backlog sizing are still evolving.

✖ Why Other Options Are Incorrect

• A. Client involvement is important during backlog refinement, but **not essential** for initial cost estimation.
• B. Arbitrarily adding 20% contingency is not a best practice. It lacks justification and precision.
• D. Lessons learned provide qualitative insights, but not quantitative cost data.

📌 Key Takeaway

When sponsors request cost estimates early in an Agile project, use **analogous estimates** based on prior projects. It’s accurate enough for business decisions while allowing Agile flexibility during delivery.