30 seconds of theory before you start
A number without a base means nothing: “3x” from 10 to 30 is a different story.
Strong questions
- «What number did you start from, and over what period?»
- «What else affected the result?»
- «What was your role in that growth?»
The usual miss
Admiring the number and not asking about the base.
You're done when
You know the starting number, the period and the candidate's role.