Metrics question
Page Creation in Facebook went down by 10%. What would you do? Let us say you have solved it. Pages are up and back to normal. However, WAUs went down by 5%. What would you do?
- Meta
- Metrics
- Hard
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What this question tests
Multi-step diagnostic reasoning, including recognizing when fixing one metric reveals a deeper, related problem.
How to approach it
- For the first drop: confirm the 10% Page Creation decline is real, then segment by platform, region, and entry point to isolate the cause.
- Check for a recent change to the page creation flow, like added verification steps or a UI redesign, as the likely direct cause.
- Fix the immediate issue, such as reverting or simplifying the flow, and confirm Page Creation returns to baseline.
- For the second drop: recognize that a 5% WAU decline after fixing Pages suggests the original fix or the original problem had a broader side effect.
- Investigate whether the page creation flow change (or its fix) affected a different, higher-traffic user journey, or whether the two drops are unrelated and coincidental.
- Segment WAU by whether users interact with Pages at all, to see if the WAU drop is concentrated among page-related users or is a broader, separate issue.
What a strong answer includes
- Explicitly treats the second drop as a new investigation rather than assuming it's automatically caused by the first fix.
- Proposes checking whether the WAU drop is concentrated among Page-related users specifically, testing causal linkage directly.
- Gives an illustrative finding, e.g. the fix for Pages introduced a bug in the main navigation affecting a broader user flow, marked as an assumption.
- Shows disciplined sequencing: solve, verify, then treat the next symptom as its own investigation rather than assuming causality.
Common mistakes
- Assuming the WAU drop must be caused by the Pages fix without testing that link directly.
- Not treating the WAU drop as seriously as the original Pages drop despite it likely representing a much bigger business impact.
Likely follow-up questions
- How would you test whether the two drops are actually related?
- Which drop would you prioritize fixing first and why?
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Learn the skill behind it
Chapters of the AI PM course that teach what this question tests.
- Chapter 9: Prove it paid off: outcomes, economics, and pricing
- Chapter 2: Data fluency: SQL, logs, and reading the truth yourself
- Chapter 14: Get the job: the AI PM interview loop