1. Ph.D. Student, Dept. of Engineering, Univ. of Cambridge, ISG-62, Trumpington St., Cambridge CB2 1PZ, U.K.
2. Laing O’Rourke Lecturer of Construction Engineering, Dept. of Engineering, Univ. of Cambridge, BC2-07, Trumpington St., Cambridge CB2 1PZ, U.K.
3. Ph.D. Student, Chair of Computing in Engineering, Ruhr-Universität Bochum, Universitätstraße 150, 44801 Bochum, Germany.
4. Associate Professor, Building Information Modelling, Faculty of Engineering, Univ. of Nottingham, Room B27 Coates Bldg., University Park, Nottingham NG7 2RD, U.K.