1. Lect., Manchester Centre for Civ. and Constr. Engineering, Project Mgmt. Division, UMIST, P.O. Box 88, Manchester, M60 1QD, U.K. E-mail: David.Lowe@umist.ac.uk
2. Prof., School of Constr. Mgmt. and Property, Gardens Point, Queensland Univ. of Technol., Brisbane Q4001, Australia (corresponding author).