1. Professor, Dept. of Civil and Environmental Engineering and the Center for Information Technology Research in the Interest of Society, Univ. of California, Berkeley, Berkeley, CA 94720. E-mail: glaser@berkeley.edu
2. Senior Research Scientist, Business and Process Management, VTT Technical Research Center of Finland, P.O. Box 1100, FI-90571 Oulu, Finland. E-mail: Anne-tolman@vtt.fi