Tell me about a time you drove a significant change — technical or process — without having formal authority. How did you build buy-in?

Imagine you're in a group project and you see a better way to organize the work, but you're not the leader. You can't just tell people what to do; you have to convince them by showing why your idea works, listening to their concerns, and getting them excited to try it. That's what this question is about — proving you can lead change through persuasion, not power.