Ye Yang Barry W. Boehm A Contextualized Study of COTS-Based E-Service Projects. 9 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3412&spage=9 2005 conf/iccbss/2005 ICCBSS db/conf/iccbss/iccbss2005.html#YangB05