Your question is Measuring a Process Change. 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).
Tell me about a time you introduced a process change and had to determine whether it was actually working. How did you decide what to measure, how did you track it, and what did you do when the data showed mixed results?