Managing a project from start to finish can be very challenging. As well as keeping an eye on the over goals, project managers have to race against time, keep everything within budget, ensure all parts fit together, and, perhaps the most challenging aspect, manage people. Project management requires a wide range of skills, and quite often, companies outsource project management to expert consulting agencies to ensure a project is successful.
Because of this drive for results, project managers can have a limited way of thinking. They often have a set of processes that have delivered results in the past on a different project with another team. Using traditional techniques can often lead to project failure. Just because something worked once doesn't mean it will work again. Just because something worked with one team doesn't mean it will work with this team. Projects are therefore driven and pushed by a set of processes rather than a project-specific framework.