Barry W. Boehm Richard Turner Rebalancing Your Organization's Agility and Discipline. 1-8 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2753&spage=1 2003 conf/xpu/2003xpu XP/Agile Universe db/conf/xpu/xpu2003.html#BoehmT03