Shouzo Hori Takako Nakatani Keiichi Katamine Naoyasu Ubayashi Masaaki Hashimoto Project Management Patterns to Prevent Schedule Delay Caused by Requirements Changes - Empirical Study on a Successful Project. 115-120 2009 ICSOFT (1) conf/icsoft/2009-1 db/conf/icsoft/icsoft2009-1.html#HoriNKUH09