1. Associate Professor, Dept. of Construction Management, Tianjin Univ., Tianjin 300072, P.R. China.
2. Professor and Chair, Building and Construction Management, Univ. of Canberra, ACT 2601, Australia.
3. Research Student, Dept. of Construction Management, Tianjin Univ., Tianjin 300072, P.R. China (corresponding author).