The correct answer is B – It prevents a wasteful buildup of requirements inventory that may never be processed. Rolling wave planning is a core agile planning practice where detailed planning is deferred until closer to execution. It aligns with lean principles by avoiding over-specification and prioritizing only near-term, high-value work.

From the PMI Agile Practice Guide:

“Rolling wave planning minimizes wasted effort by only detailing work that is near execution. Planning further ahead can result in rework or unused artifacts if requirements change or become irrelevant.”

(PMI Agile Practice Guide, Section 5.3 – Adaptive Planning and Rolling Wave Planning)

Mike Griffiths writes:

“Agile avoids big upfront planning. Rolling wave planning reduces waste, improves responsiveness, and focuses on delivering the highest-value features first while leaving less valuable work unplanned until necessary.”

(Mike Griffiths, PMI-ACP Exam Prep, Chapter 5 – Adaptive Planning)

Incorrect options:

A is misleading; agile allows varying levels of detail, not fixed.

C is a traditional (waterfall) planning mindset.

D suggests fixed scope per release, which contradicts agility.

Answer: B

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