Describe a time when one of your projects failed. What did you learn from that experience?

This is a behavioral question, so you should frame your answer using the STAR format. Describe the Situation, discuss the Task you needed to complete, then walk the interviewer through the Actions you took. The most important part of your responses is the results you obtained. This will indicate to the interviewer that even though you failed, you were either able to overcome it, or you learned a lesson that would prevent the same failure from recurring.

"In my most recent role, I was tasked to create an internal software application for the organization. I agreed that my team and I could create the application within a month. During the development process, we realized that some of the code was more complex than we had anticipated and consequently took more time to develop than we estimated. I realized I had underestimated the time required to complete the project. Eventually, we delivered the application per the client's specifications. I learned from this that it is essential to assess the requirements of a project carefully to know exactly how much time will be needed to complete it."