Keishi Sakamoto Naoki Niihara Toshifumi Tanaka Kumiyo Nakakoji Kouichi Kishida Analysis of Software Process Improvement Experience Using the Project Visibility Index. 139- 1996 conf/apsec/1996 APSEC http://csdl.computer.org/comp/proceedings/apsec/1996/7638/00/76380139abs.htm db/conf/apsec/apsec1996.html#SakamotoNTNK96