Scenario

A consumer messaging app is preparing to launch group video calling. You have access to rich data: message logs (timestamps, thread IDs), friend/interaction graphs, 1:1 call logs, and user surveys.

Task

Design an analytics plan that:

1. Quantifies latent demand for group video calling using existing data (messages, friend graphs, surveys).
2. Defines the primary success metrics for launch.
3. Proposes an experimental design to evaluate impact while handling network interference.
4. Recommends a data-driven initial cap on the number of participants allowed in a group call, considering user coverage versus engineering/quality costs.

Hints

• Consider interaction clustering (e.g., communities, group threads), A/B tests with guardrails, retention/attach rate, percentile analysis of desired group sizes, and the trade-off between engineering cost/quality and user coverage.