J. B. Rainsberger Ron Jeffries Rick Mugridge Exploring Programmer Tests. 212 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2753&spage=212 2003 conf/xpu/2003xpu XP/Agile Universe db/conf/xpu/xpu2003.html#RainsbergerJM03