1. Research Scholar, Dept. of Building, School of Design and Environment, National Univ. of Singapore, 4 Architecture Dr., Singapore 117566.
2. Professor, Dept. of Building, School of Design and Environment, National Univ. of Singapore, 4 Architecture Dr., Singapore 117566.
3. Professor, Construction Engineering and Management Dept., College of Environmental Design, King Fahd Univ. of Petroleum and Minerals, P.O. Box 680, Dhahran 31261, Saudi Arabia.