← Google Interview Insights

Google·Product Manager·Onsite - Product Sense / Strategy·Senior

Senior
Jun 2026

Summary

Had a PM interview at Google that basically came down to one product metrics question about BART. Short session, not a lot of back-and-forth, left feeling like I probably could've gone deeper.

Questions Asked (1)

Q1

How would you define and measure success metrics for BART (the transit system)?

Product Analytics & MetricsProduct Strategy
Author's notes

I started with ridership and on-time performance, which felt obvious the moment I said it out loud.

Create a free account to read the full note

AI HintsAI Generated

Suggested Approach

Start by clarifying the goal of BART as a public transit system—balancing rider experience, operational efficiency, and societal impact. Then propose a metrics framework that ties leading and lagging indicators to these goals, and explain how you would prioritize and iterate on them.

Pro tip: Acknowledge that BART is a public service, not a profit-driven product, so success metrics must include social and environmental outcomes alongside rider satisfaction and operational performance. Show you can balance competing stakeholder needs.

1. Define success from multiple perspectives

Identify key stakeholders (riders, operators, government, community) and what success means for each. For example, riders want reliability and affordability; operators want efficiency and safety; the community wants reduced congestion and emissions.

2. Map goals to measurable outcomes

Translate each stakeholder goal into quantifiable metrics. Use a mix of leading indicators (e.g., app engagement, station cleanliness scores) and lagging indicators (e.g., ridership, on-time performance, customer satisfaction).

3. Prioritize metrics with a framework

Use a prioritization framework like HEART or OKRs to select a balanced set of metrics. Consider impact, actionability, and cost of measurement. Avoid vanity metrics.

4. Set targets and establish a cadence

Define baseline values and ambitious but achievable targets for each metric. Establish a regular review cadence (e.g., weekly for operational, quarterly for strategic) to track progress and adjust.

5. Iterate and communicate

Use the metrics to drive decisions, A/B test improvements, and communicate impact to stakeholders. Be ready to refine metrics as the system evolves.

Key Points to Mention

  • Ridership and retention metrics (e.g., daily unlinked trips, rider retention rate)
  • Operational efficiency (e.g., on-time performance, cost per passenger mile, mean distance between failures)
  • Customer satisfaction (e.g., NPS, cleanliness, safety perception, ease of payment)
  • Accessibility and equity (e.g., station accessibility, affordability for low-income riders, coverage in underserved areas)
  • Environmental impact (e.g., reduction in car emissions, energy efficiency)
  • Financial sustainability (e.g., farebox recovery ratio, subsidy per rider, revenue from ads/partnerships)

AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.