PB Network (c)2006

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 Research Library >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 PB employees via the PB Intranet, http://www.pbworldnet.com. Go to PB News > PB Publications > PB Network > View All Issues Here. 

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).

Executive Editor: John Chow, Office of Professional Practice, 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: Kathy Leotta, Seattle, Washington
Graphic Designer: Laurie Ludwin, Graphic Services Group, New York, New York

Production Manager: Michael Babin, New York, New York

Web Team: Deena Hamdani, New York, New York; Sara Stein, New York, New York

Column Coordinators: Gordon Clark, Seattle, Washington, "The Net View;" Jules Loweff, New York, New York, "Space Track;" David Trainer, Sydney, Australia, "Computer Tutor;" Tracy Abbott, New York, New York, R&I; Kathy Leotta, Seattle, Washington, "Globetrotters" 

Guest Technical Editors for this Issue: David MacIntyre, Orlando, Florida; George Schlutermann; Orlando, Florida; Tanisha Walters, Orlando, Florida.

Guest Technical Reviewers for this Issue: Tim Blagsvedt, Indianapolis, Indiana; Dave Earley, Washington, DC; Glenn Nestel , Baltimore, Maryland; Alasdair Groves, Bristol, UK; Jim Jensen, San Diego, California; Peter Kydd, Bristol, UK, Dan Lanning, Dallas, Texas, Chin Lien, Baltimore, Maryland; Steve McKelvie, Boston, Massachusetts; Doug Pickell, Orlando, Florida; Jon Price, Bristol, UK; Jon Ralph,  Bristol, UK; Henry Russell, Boston; Massachusetts; Peter Sushinsky, Orlando, Florida; Brian Van Weele, San Francisco, California    

Advisors: Judy Cooper, New York, New York; Paul Gilbert, Seattle, Washington; St. John Herbert, Brisbane, Australia; Alan Knott, Merseyside, U.K.