In a preliminary meeting for a project, team members decide to execute the project with...

According to the Agile Practice Guide and the PMBOK® Guide, the approach to cost estimation varies significantly depending on the project life cycle. In an agile or adaptive environment, requirements are expected to evolve, making traditional, granular estimation difficult at the start.

Lightweight Cost Estimation (Choice A): In the early stages of an agile project, the team uses " lightweight " or high-level estimation techniques (such as T-shirt sizing, Story Points, or Relative Sizing). Because the full scope is not yet decomposed into a detailed Work Breakdown Structure (WBS), the goal is to provide a " Rough Order of Magnitude " (ROM) estimate. As the project progresses and the backlog is refined, these estimates become more accurate. This allows the team to remain flexible without wasting time on detailed calculations for requirements that might change.

Detailed Cost Estimation for Agile (Choice B): This is a contradiction in terms for the early stages of an agile project. Detailed estimation requires a fixed and stable scope. In agile, detailed estimation usually only happens at the iteration (Sprint) level for the immediate work at hand, not for the entire project at a preliminary meeting.

Previous Project Budget (Choice C): While Analogous Estimating (using a previous project) is a valid technique, simply " retrieving " a budget and setting a baseline without adjusting for the current project ' s specific complexities or constraints is poor practice and leads to inaccurate budgeting.

Detailed WBS (Choice D): This is the hallmark of a Predictive (Waterfall) life cycle. Creating a detailed WBS and performing Bottom-up Estimating requires the scope to be fully defined upfront. This is not appropriate for a project following " Methodology A " if that methodology is adaptive, or for any project in its " preliminary " stages where such detail does not yet exist.

In agile environments, the focus is on Value-Based Prioritization. The finance team should understand that while a high-level budget is set early on, the specific allocation of funds is managed dynamically as the team discovers which features deliver the most value during each iteration.