This is a very nice way of asking if you’ve learned from your mistakes. Nobody’s going to get it right all the time, and they’re going to want to know how you deal with adversity. Now, if your actions directly resulted in torpedoing a billion-dollar M&A deal … perhaps you may not want to mention that! But be prepared to talk about a project or deal that didn’t go as planned. Don’t blame others too much, either. Take responsibility for your part and explain how you’ve changed your approach since. Send the message that you learned something from the experience.