Unsuccessful projects often lack collaboration between key parties. When the Icelandic volcano erupted, key parties didn’t communicate for too long which resulted in disruption to aviation across Europe. IT methodologies have definable, planned, controlled activities and timelines which allow you to say what to do, when to do it and how to do it.
But IT methodologies only deal with the hard definable activities and not with the complex people issues and soft problems. Complex problems need people who are willing to learn, willing to share, able to adapt. Engaged people get things done.
That’s my view. You can join the debate with The Open University.