Lisa Brownsword Jim Smith Using Earned Value Management for COTS-Based Systems: Issues and Recommendations. 13-24 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3412&spage=13 2005 conf/iccbss/2005 ICCBSS db/conf/iccbss/iccbss2005.html#BrownswordS05