What mistakes did the Air Force make in this project?

Please copy & paste the URL below into your browser’s address bar and click the return key. (or simply click on the URL)http://blogs.wsj.com/cio/2013/02/05/air-force-hopes-it-overhaul-takes-wing/Read the article and answer the following questions:Why are ERP (and other large programs) so difficult to implement and why do they fail to deliver so often?What mistakes did the Air Force make in this project?Why are ERP systems important?