1. Assistant Professor, Dept. of Building, National Univ. of Singapore, Singapore 117566.
2. Associate Director, Construction Industry Institute, Austin, TX 78759-5316.
3. Professor, Dept. of Civil Engineering, Univ. of Waterloo, Waterloo ON, Canada N2L 3G1.
4. Assistant Professor, Dept. of Civil, Architectural, and Environmental Engineering, Univ. of Texas at Austin, Austin, TX 78712-0276.