You're halfway through a project and notice that you definitely missed a significant milestone. This could mean a complete re-work. How do you handle the situation?

"I try to avoid being the cause of delay at any cost, but this is something I encountered and have learned from earlier in my career. When this happened to me, I immediately communicated with my team. I presented them with what I understood to be broken, and we built a Plan B and Plan C together. We discussed quickly and thoroughly, and then I immediately informed my project sponsors. I presented them with decision points, and we were able to get back on track. My mistake caused us to miss the deadline by a couple of weeks, but it would have been longer, had I not come up with options."