Good communication is one of the best ways to identify the red flags that pop up when something starts to go wrong with an implementation.  A lack of good communication can be one of the first warning signs that an implementation is in danger of failing.  Another important component to keeping an implementation on track is to have a project lead acting as a liaison. If there is a lack of leadership or if no one is championing the project within the business, the implementation can fail. 

Once an implementation does run into trouble, the chances of turning it around depend on the nature of the problem. The first thing to do is take a step back and look at the situation to pinpoint how the system is not meeting expectations.

And sometimes you just have to start all over again.