The correct answer is D – Reestimate all stories including values for A, B, and C. Agile promotes empirical process control, meaning teams adapt based on what they learn. When significant deviations are found in actual effort vs. story point estimates, the team should revisit and refine their estimation process, including reestimating stories to better align with reality.
From the PMI Agile Practice Guide:
“Estimates are revisited based on experience. Teams inspect and adapt during retrospectives, using data to improve future estimation accuracy.”
(PMI Agile Practice Guide, Section 5.3 – Estimation and Planning)
Mike Griffiths writes:
“When estimates prove inaccurate, teams should reestimate affected stories. Estimating is a collaborative process, and learning from past deviations is a key part of adaptive planning.”
(Mike Griffiths, PMI-ACP Exam Prep, Chapter 5 – Adaptive Planning)
Incorrect options:
A may distort estimation by comparison and not correct the root issue.
B manipulates velocity data and violates agile principles of transparency.
C attempts to “force fit” effort rather than inspect and adapt.
Answer: D
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