First of all, every troubled projects are doomed to failure? While in the same time not all troubled projects can be successfully rescued. Then plan simple key steps you need to try. There are many topics on the internet and books published on rescuing failed projects. These simple areas may guide to turn a project back on track.
The Characteristics of Agile Iterations: Most people understand that the days of the huge monolithic project are over - and have been for some time. The better approach is to break large projects into a set of smaller, easier to manage projects. Short projects are easier to manage than large projects. There are fewer things that can go wrong, fewer people involved, less time for scope changes, etc.