Metrics question

What's the north star metric for Google Calendar?

Practice this question out loud. An AI interviewer asks it, follows up like a real interviewer would, and scores your answer. Type or speak.

What this question tests

Ability to identify a single north star metric that captures the core value of a utility scheduling product.

Clarify the core value: the calendar helps users manage and follow through on scheduled commitments, alone or with others.
Consider candidate metrics: events created, events attended, weekly active users, and time saved scheduling.
Rule out events created alone, since it doesn't capture whether the calendar actually helped someone follow through.
Propose the north star: weekly active users who both create and attend a scheduled event, capturing genuine reliance on the tool.
Explain supporting metrics: invite acceptance rate and meeting-scheduling time, which feed into the north star.
Note the guardrail: notification and reminder effectiveness, since a calendar people ignore isn't truly useful.

Explicitly rules out a superficial candidate metric and explains why it fails to capture real value.
Proposes a north star tied to actual follow-through, not just creation, a meaningfully better bar.
Names supporting metrics that causally feed the north star, showing a coherent metric tree.
Adds a guardrail around reminder effectiveness, a real usability lever for a calendar product.

How would you weigh personal events versus shared meeting events in this metric?
How would you detect if users were scheduling but not really using the calendar as intended?
How would this north star differ for enterprise versus consumer users?