1. Assistant Professor, Dept. of Construction and Operations Management, South Dakota State Univ., 907 Campanile Ave., Solberg Hall, Brookings, SD 57006 (corresponding author).
2. Associate Professor, Dept. of Civil, Environmental and Architectural Engineering, Univ. of Kansas, 1530 W. 15th St., 2135C Learned Hall, Lawrence, KS 66045.