{"blocks": [{"key": "79b4e114", "text": "Scenario", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "cee8f798", "text": "After shipping the group video-call MVP, Instagram needs to track whether the feature drives engagement and retention.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "34eaa302", "text": "Question", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "1c8e699d", "text": "What business goals should define success for the new feature? Which engagement or retention metrics would you monitor and why? Should metrics measure overall app usage or the video-call module only? How would you define and calculate churn for this context?", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "dbd0df0c", "text": "Hints", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "7f5e2304", "text": "Connect feature-level metrics to higher-level KPIs (DAU/WAU/MAU, session time, churn, latency) and explain trade-offs.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}], "entityMap": {}}