Choosing YouTube's North-Star Metric, Supporting Metrics and Guardrails as Its PM

You are the product manager responsible for YouTube as a whole. Which metrics would you focus on to judge whether the product is healthy and heading in the right direction? Explain how you would choose them, which one you would treat as the most important, and how the others relate to it. ```hint Map who gets value YouTube serves more than one group, and each group's activity feeds the others. Work out what each group gets from the product before you pick a number, then ask how that number could rise while the product actually gets worse. ``` ### Clarifying Questions - Is the scope all of YouTube, or one surface such as Shorts, Music, Premium or the TV app? - Are these metrics for steering product decisions, or for reporting business health to leadership, where revenue would sit at the top? - Should signed-out viewers and every device type (mobile, desktop, connected TV) count in the same metrics? - Is the priority defending a mature product's core audience, or finding new growth in particular regions or formats? ### What a Strong Answer Covers - The mission and a map of the viewer, creator and advertiser sides, showing how value flows between them. - One top metric with a precise definition, chosen over named alternatives such as active users, views or raw watch time. - Supporting metrics for each side, organized so that a change in the top metric can be traced to its cause. - Guardrails against growth that hurts the product: low-quality or harmful content, ad overload, creator churn and playback quality. - How the metrics are segmented and used to settle a real trade-off. ### Follow-up Questions - Short-form video grows total views while long-form watch time falls. How would your metrics tell you whether that shift is good for YouTube? - A recommendation change lifts watch time, but you suspect it is promoting sensational videos. Which metrics would confirm or rule that out? - If leadership allows only one creator-side metric on the dashboard, which do you choose and why?