Which THREE are common pitfalls in product backlog management?
An oversized backlog becomes unnavigable: items lose visibility, prioritisation degrades, and lower-value entries linger indefinitely. This directly violates the agile principle of a lean, ordered backlog refined continuously, so it qualifies as a recognised backlog management pitfall.
Why this answer
Option A is correct because an excessively large backlog becomes unnavigable, obscuring priorities and making it hard for the Product Owner to keep the most valuable items at the top for the team. Option C is correct because without regular backlog refinement (grooming), items grow stale, estimates become unreliable, and the team loses shared understanding of upcoming work. Option E is correct because deferring technical debt until it causes failures is a classic backlog-management pitfall that eventually cripples velocity and product stability.
Option B does not belong because involving the team in planning is a recommended agile practice, not a pitfall. Option D does not belong because a clear, prioritized backlog is the desired state of good backlog management, not a pitfall.
Exam trap
PMI-ACP often tests whether candidates can distinguish genuine agile anti-patterns from healthy practices, so options describing good behaviors (clear prioritized backlog, team involvement) are planted as distractors that sound plausible if you are scanning for 'problems' rather than evaluating each option on its merits.