1. Senior Lecturer, Dept. of Construction Management, Faculty of Technology Management and Business, Universiti Tun Hussein Onn Malaysia (UTHM), Parit Raja, Batu Pahat, Johor 86400, Malaysia (corresponding author).
2. Professor, Construction Engineering and Management, School of Civil Engineering and Built Environment, Faculty of Science and Engineering, Queensland Univ. of Technology, Brisbane, QLD 4001, Australia.