1. Dept. of Civil and Environmental Engineering, Univ. of California, Berkeley, CA 94720-1712; and Assistant Professor, Dept. of Construction Engineering and Management, Pontificia Universidad Católica de Chile, Engineering School, Santiago 7820436, Chile (corresponding author).
2. Professor and Director, Dept. of Civil and Environmental Engineering, Project Production Systems Laboratory, Univ. of California, 212 McLaughlin Hall, Berkeley, CA 94720-1712.
3. Research Director, Project Production Systems Laboratory, Univ. of California, Berkeley, CA 94720-1712.