I had one of two of my final round interviews yesterday and unfortunately it did not go well. The interviewer asked me for a time I overcame a difficult challenge. I responded with an example where I was leading a client team and how I had to convince them to do the task at hand despite them not wanting to. He wasn't happy with that response and asked for another example. Can you please share examples of what a really difficult challenge is and specifically what was done to over come it - either from interviews you have heard or your own personal experiences?