Extreme programming and agile processes in software engineering : 4th international conference, XP 2003 : Genova, Italy, May 25-29, 2003 : proceedings. : May 2003, Genova, Italy / Michele Marchesi, Giancarlo Succi, FreeUniversityofBolzano-Bozen.FacultyofComputerScience.CenterforAppliedSoftwareEngineering, ほか