1. Professor and Associate Head for Graduate Programs, Dept. of Civil, Construction, and Environmental Engineering, North Carolina State Univ., Raleigh, NC 27695-7908. E-mail: johnston@eos.ncsu.edu
2. Senior Test Developer, Prometric, 2000 Lenox Dr., Lawrenceville, NJ 08648. E-mail: nancy.thomas@prometric.com
3. Consultant to Industry and President, Gwyn Consulting Services, Inc., Charlotte, NC 28210. E-mail: mbanksg@aol.com