PB Network ©2005

Parsons Brinckerhoff Inc., One Penn Plaza, New York, NY 10119, 1-212-465-5000. All rights reserved. Articles may be reprinted only with permission from the Executive Editor. This journal is intended to foster the free flow of ideas and information among PB staff. The opinions expressed by the writers are their own and are not necessarily those of Parsons Brinckerhoff.

Past issues of PB Network starting from 1995 are available electronically on PB's web site http://www.pbworld.com, under the button "NEWS + EVENTS >PB Publications > PB Network," or go directly to http://www.pbworld.com/news_events/publications/ network/. All recent issues are available in pdf with recent issues available in reader-friendly html format.

Past issues are also available to PBemployees via the PBIntranet, http://www.pbworldnet.com. Go to PBNews > PBPublications > PBNetwork > View All Issues Here. Past issues are also available (in pdf format) to PBemployees via PB’s Outlook public folders, under PBPublications & News/PBNetwork.

PB employees can request additional printed copies to use for conferences, seminars and proposals by contacting Janet Rose in New York (1-212-465-5107, rosej@pbworld.com) <mailto:rosej@pbworld.com>).

Executive Editor: John Chow, Advanced Technology, New York, New York, chow@pbworld.com

Editor: Lorraine Anderson, Office of Professional Practice, New York, New York

Associate Editors: Brian Brenner; Gordon Clark, Seattle, Washington; Willa Garnick, Office of Professional Practice, New York, New York

Assistant Editors: Cade Hobbick, New York, New York; David Kantor, New York, New York; Kathy Leotta, Seattle, Washington; Tracy Nixon, Dublin, Ohio

Graphic Designer: Laurie Ludwin, Graphic Services Group, New York, New York

Web Designer: Hetal Joshi, New York, New York; Steven Cipolloni, Princeton, New Jersey

Column Coordinators: Gordon Clark, Sea ttle, Washington, “The Net View”; Jules Loweff, New York, New York, “Star Track”; David Trainer, Sydney, Australia, “Computer Tutor”

Guest Technical Reviewers for This Issue: Peter Collins, Bristol, UK; Tom Brooks-Pilling, St. Louis, Missouri; Adeline Koh, Singapore; David Luscombe, Godalming, UK; David Tze Kwong Tse, Singapore; Vincent Tse, Hong Kong

Advisors: Judy Cooper, New York, New York; Paul Gilbert, Seattle, Washington; Marcia Earle, New York, New York; Emil Cheung, Hong Kong; Chin Hwi Gan, Singapore; St. John Herbert, Brisbane, Australia; Alan Knott, Merseyside, U.K.