1. Senior Lecturer, Univ. of Nottingham, School of Civil Engineering, University Park, Nottingham NG7 2RD, U.K.
2. Assistant Professor, Dept. of Construction Process Management, Univ. of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.
3. Postdoctoral Student, Univ. of Nottingham, School of Civil Engineering, University Park, Nottingham NG7 2RD, U.K.