Welcome to your interview.
The question is on your right: Measuring Process Improvement. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
What specific metrics did you use to measure the success of your most recent process improvement initiative?