1. Post Doctoral Scholar, School of Civil Engineering, Purdue Univ., West Lafayette, IN 47907-2051 (corresponding author).
2. Ph.D. Candidate, School of Civil Engineering, Purdue Univ., West Lafayette, IN 47907-2051.
3. Professor and Head, Division of Construction Engineering and Management; and Professor, Civil Engineering, Purdue Univ., West Lafayette, IN 47907-2051.
4. Associate Professor, Dept. of Political Science, Purdue Univ., West Lafayette, IN 47907.