R. Owen Rogers Acceptance Testing vs. Unit Testing: A Developer's Perspective. 22-31 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3134&spage=22 2004 conf/xpu/2004xpu XP/Agile Universe db/conf/xpu/xpu2004.html#Rogers04a