1. Prof., Dept. of Civ. Engrg., Aristotle Univ. of Thessaloniki, Thessaloniki 54006, Greece; formerly, Dir. Business Process Improvement, McDermott International, Inc., New Orleans, LA 70112. E-mail: dangelid @civil.auth.gr
2. Grad. Student, Dept. of Civ. Engrg., Aristotle Univ. of Thessaloniki, Thessaloniki 54006, Greece.
3. Grad. Student, Dept. of Civ. Engrg., Nat. Tech. Univ. of Athens, Zografou 15780, Greece.
4. Doctoral Candidate, Dept. of Civ. Engrg., Aristotle Univ. of Thessaloniki, Thessaloniki 54006, Greece.