1. Ph.D. Candidate, Faculty of Civil and Environmental Engineering, Technion City, 32000 Haifa, Israel. E-mail: shabtai@technion.ac.il
2. Associate Professor, Head, Construction Management and Econo-mics, National Building Research Institute (NBRI), Faculty of Civil and Environmental Engineering, Technion City, 32000 Haifa, Israel (corresponding author). E-mail: ronie@technion.ac.il