North-Star and Guardrail Metrics for Measuring Android's Success as a Platform

Android is Google's mobile operating system, used by many phone manufacturers on their devices. How would you define success for Android, and which metrics would you track to measure it? Name the single metric you would treat as most important and justify it, then add the supporting and guardrail metrics that complete the picture. ```hint Several groups must keep choosing it Android only thrives if people who buy phones, the manufacturers that build them and the developers who write apps all keep choosing it. Consider what each group needs from the platform and what Google gets back. ``` ### Clarifying Questions - Should success be judged from Google's point of view, or for the open-source project as a whole, including devices that ship without Google's apps and services? - Are we measuring phones only, or also tablets, watches, TVs and cars that run Android? - What decision will these metrics support: an annual review of the platform's health, or judging a single new Android release? ### What a Strong Answer Covers - Android's goal and the stakeholders its success depends on: users, manufacturers, developers and Google. - One clearly defined north-star metric, and why it beats alternatives such as market share, devices shipped or app count. - Supporting metrics per stakeholder, covering reach, engagement and loyalty, platform quality and security, and ecosystem health. - Guardrails for fragmentation, security, privacy and performance, plus the ways the chosen metrics could be gamed, mismeasured or misread. ### Follow-up Questions - Monthly active devices keep growing, but more users switch to a rival platform when they replace their phone. How do you read that, and what do you investigate? - How would you measure the success of one new Android version, as opposed to the platform as a whole? - Which of your metrics can Google not measure directly, and how would you estimate them?