Google Maps: Choosing a North-Star Metric, Funnel Inputs and Guardrails
Company: Google
Role: Product Manager
Category: Analytics & Experimentation
Difficulty: medium
Interview Round: Other
You are a product manager on Google Maps. The interviewer wants to know how you would tell whether Google Maps is succeeding: which metrics would you track, which single one would you treat as the primary measure, and why?
```hint Walk the journey first
Trace what a person does between typing a place name and standing at the door, and what a business gains when someone finds it. Then ask which step proves Maps actually helped, rather than just got opened.
```
### Clarifying Questions
- Should the metrics cover only the consumer app, or also businesses that manage their listings on Maps and developers who pay to use the Maps APIs?
- Which jobs are in scope: driving navigation, transit and walking directions, finding and evaluating local places, or all of them?
- Is this for the product as it is today, with a very large and mature user base, or for an early stage where adoption would matter more?
- Should revenue measures, such as ads shown in local search results, count toward success, or only user value?
### What a Strong Answer Covers
- A brief statement of what Maps is for and its main user groups, used to choose where to focus.
- One primary metric that reflects a user getting value, such as arriving somewhere or acting on a place, defined precisely enough to compute.
- Input metrics along the journey: search, place details, directions, navigation start and completion, and repeat use on a weekly cadence.
- Quality and guardrail metrics such as ETA accuracy, wrong place information, crashes, battery or data drain, and trust risks from monetization.
- Awareness of misleading measures, such as reading more time in the app as good news for a navigation product.
### Follow-up Questions
- The navigation completion rate dropped noticeably week over week in one country. How would you work out why?
- Many people end guidance once the destination is in sight. How would you define "arrived" so that habit does not distort your metric?
- How would your primary metric change if you owned the business listings side instead?
Overview: A metrics question about Google Maps: pick one primary success measure, the input metrics along the journey from search to arrival, and guardrails for quality and trust. It tests user segmentation, precise metric definitions and avoiding misleading signals such as time spent in the app.