"I would pick a previous project that failed because of the lack of prioritization. At the onset, leadership told us that this was going to be an open-ended pet project. They also had a few creative ideas for us to explore. I would assign team members tasks, but those tasks kept getting pushed down to prioritize other projects that were more profitable for the company. It finally got shoved after several months. In retrospect, I should have put my foot down at the beginning and asked for an ROI analysis to see if it was worth starting the project at all. There was no business case or clear goals. The problem was that I was too new to the company that I didn't feel confident asserting myself. I've since learned to bring up any disagreements I had with leadership, as long as I'm able to use numbers to support my case."