I worked as a part of a 5 person team to develop a new electronic data management system, as our old one was no longer fitting for our needs. To begin with, we brainstormed as a team to come up with our requirements, and then how to fulfill those requirements. Once they were listed, I took the lead and split out the tasks, and delegated them to each individual whose skills it suited. I then set milestones, as I went about my own tasks. Our project was very successful due to the constant communication and very strict milestones and understanding of the project."
They would determine that I am a leader and tend to take that position if it is a "free for all", that groups I work in appear to become successful, but they would not know if I could adapt - except to the position of leadership. They may have a follow up question such as, "Did you hit any roadbumps during the project? How did you handle it?" -- while saying "No" might be true, it would be best to find at least a small one - even if one of my team members was late on their delivery by a day or something.