From FIg.2 Past the Tipping Point:THe Persistence of Firefighting in Product Development by Nelson Repenning, Paulo Goncalves and Laura Black. Calif. Mgt. Review 43(4) p44-63 (2001). Also From William E. Novak and Linda Levine CMU SEI Sept 2010 Success in Acquisition: Using Archetypes to Beat the Odds paper and see webpage