Scenario

You work on a digital learning product and your team has launched a new feature that is intended to help students come back more often. Early usage looks promising, but retention is noisy and leadership wants to know whether the feature truly improved user retention rather than just creating a short-term engagement bump.

Question

How would you evaluate whether the new feature actually improved retention? Walk through the experiment you would run, how you would measure success, and how you would decide whether to ship.