questions / rca
rca questions
01 Daily active users dropped 20% week over week. Find the root cause.A diagnostic sequence for the PM RCA interview. Covers the measurement-error trap, step-change vs. trend bisect, and AI-product failure modes. hard → 02 Facebook Groups engagement dropped 15% over the past month. How do you find the root cause?A Meta RCA interview question. Covers the measurement-error check, segmentation tree, AI feed ranking hypotheses, and how to commit to a cause. hard → 03 You're a PM at Instagram. Feed post volume has declined 15% over the past six months while Stories usage has grown. Is Stories cannibalizing posts? What do you do?How to diagnose and respond when Stories growth correlates with a feed post drop. RCA, cannibalization vs. substitution, and what to do next. hard → 04 Notification engagement is up six weeks running, but time on site is flat. What do you do?A worked answer for the Meta PM interview question where notification engagement rises but time-on-site stays flat. Covers the full hypothesis tree. hard → 05 Facebook Groups engagement dropped 15%. Diagnose the root cause.How to structure a Meta RCA interview answer on Groups engagement: measurement check, supply vs demand split, and the 2026 AI-feed hypothesis. hard → 06 Instagram MAU is flat but DAU has been declining for the past several weeks. Walk me through how you would diagnose this.How to diagnose a metric divergence in a Meta PM interview. MAU flat + DAU down is a deductive constraint, not just context. hard → 07 Messenger DAU dropped 8% last week. Walk me through how you'd find the root cause.How to diagnose a Messenger DAU drop in a Meta PM interview, from data integrity checks to cannibalization hypotheses and the 'so what' close. hard → 08 There is a data point showing more Uber drop-offs at the airport than pickups. Why might that be, and what would you do about it?Uber airport imbalance RCA: supply-side driver economics, FIFO queue mechanics, and what separates a strong answer from a pattern-match. standard → 09 Reddit traffic is down 5% week-over-week. What do you do, and what do you tell the exec team?A complete RCA answer for the Reddit traffic drop interview question, covering the diagnostic process and exec communication under uncertainty. hard → 10 Retention dropped 5% last week. Walk me through how you'd diagnose it.How to run a retention RCA in a PM interview. Covers data integrity gates, cohort decay types, segmentation order, and 2026 AI-cause additions. standard → 11 A key streaming metric dropped 80% overnight. Walk me through your root cause analysis.A streaming-specific RCA walkthrough for PM interviews. Covers the 80% magnitude signal, hypothesis tree, and 2026 AI model failure modes. hard →