The correct answer is D – Estimating the relative size of stories by using story points.
Planning poker is a consensus-based estimation technique used in Agile to assign relative size (often using story points) to product backlog items. Each team member selects a card to indicate their estimate, and the group discusses discrepancies to reach agreement.
From the PMI Agile Practice Guide:
“Planning poker is a consensus-based estimation technique that helps teams estimate the size of user stories using story points. It supports collaboration and shared understanding.”
(PMI Agile Practice Guide, Section 5.3 – Estimation Techniques)
Mike Griffiths writes:
“Planning poker helps teams perform relative sizing using a modified Fibonacci sequence. The goal is not precision, but shared understanding and relative complexity comparison.”
(Mike Griffiths, PMI-ACP Exam Prep Book, Chapter 5 – Adaptive Planning)
Why other options are incorrect:
A describes analogy-based estimation, not planning poker.
B refers to “bucket system” estimation, a separate technique.
C refers to dot voting, which is a prioritization—not estimation—tool.
Answer: D
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