What has been one of the most significant mistakes you have ever made on an IT project?

"Probably the biggest mistake I've ever made on a critical IT project was to ignore the indicators that the project was falling behind schedule. I accepted the explanations provided to me by my team at face value. This was my fault, not theirs. What I should have done was to investigate the reasons we were falling behind schedule and take corrective actions to mitigate them. Once I realized this, I immediately got more involved with the project and went as far as working alongside my team to get us back on schedule. The lesson I learned from this was to trust but verify the information provided to me by our team members and the other indicators I use to monitor the progress of a project."