Your question is Measuring Impact. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Comment est-ce que tu mesurais l'impact ?
In a UX/UI design review, you are asked to explain how you would measure whether a design change actually improved the product. Focus on the metric choice, how you would attribute change to the design, and what guardrails you would watch. Keep the answer practical and specific.