1. Professor of Systems Engineering and Civil and Environmental Engineering, Massachusetts Institute of Technology, Room E-40-245, M.I.T., Cambridge, MA 02139.
2. Intermediate Airport Systems Analyst, ArupNAPA St. 1606, 365 Bloor St. East, Toronto, ON, Canada M4W 3L4.
3. Senior Analyst, Simat, Helliesen & Eichner, Inc., 1 Main St., Cambridge, MA. 02142.