Christ Vriens Certifying for CMM Level 2 and ISO9001 with XPAtsignScrum. 120-124 2003 conf/agiledc/2003 Agile Development Conference http://csdl.computer.org/comp/proceedings/adc/2003/2013/00/20130120abs.htm db/conf/agiledc/agiledc2003.html#Vriens03