Projects that have failed

NEED TODAY

Have you participated in the creation of a project that failed?  Why did it fail?  Based on the System Development Life Cycle Model, what could have been done to help the project succeed? If you have never participated in a project that failed, you can use an example of a project that you have heard of or you can just provide your opinion on what you think might be some of the causes of failed projects.  Base your responses on the phases of the SDLC.