[1] Colorado State Univ, Dept Construct Management, Guggenheim Hall, Ft Collins, CO 80523 USA
[2] Virginia Polytech Inst & State Univ, Myers Lawson Sch Construct, Blacksburg, VA 24061 USA
[3] Virginia Polytech Inst & State Univ, Grado Dept Ind & Syst Engn, Blacksburg, VA 24061 USA