1. Principal Researcher, U-City Center of Excellence, Samsung SDS Co., Ltd., 159-9 Gumi-dong, Bundang-gu, Seongnam-si, Gyeonggi-Do, Korea.
2. A. J. Clark Chair Professor in Project Management, Dept. of Civil and Environmental Engineering, A. J. Clark School of Engineering, Univ. of Maryland, College Park, Maryland.
3. R. H. Smith Chair Professor, Dept. of Decision and Information Technologies, Robert H. Smith School of Business, Univ. of Maryland, College Park, Maryland.
4. Associate Professor of Project Management, Dept. of Decision Sciences, School of Business, The George Washington Univ., Washington, DC 20052. E-mail: kwak@gwu.edu