A project manager has been assigned to a new project that will be delivered using an agile framework. The sponsor is asking for a cost estimation to build the business case. What should the project ma

Involving a client representative in *cost* estimation is not the primary immediate action; client involvement is crucial for scope and feature prioritization, but not necessarily for the *initial cost estimate* for a business case.

A 20% contingency is an arbitrary number and not a valid estimation technique for building a business case; contingency is determined based on risk analysis, not a fixed percentage.

When establishing a business case, an initial cost estimation is often high-level and relies on historical data. Reviewing the completion costs of similar projects is a form of analogous estimating, which is suitable for early-stage estimates in both traditional and agile contexts when detailed scope may still be evolving.

Reviewing lessons learned from similar projects is valuable for process improvement and risk identification, but it doesn't directly provide the *cost estimation* needed for a business case.