Tom McBride Brian Henderson-Sellers Didar Zowghi Project Management Capability Levels: An Empirical Study. 56-63 2004 conf/apsec/2004 APSEC http://doi.ieeecomputersociety.org/10.1109/APSEC.2004.77 db/conf/apsec/apsec2004.html#McBrideHZ04