1 Tradeoffs among Planned vs. Performed Activity Patterns Mahdieh Allahviranloo 1 , Will Recker 2 , Harry J.P. Timmermans 3 ‘1 Department of Civil Engineering, The City College of New York – CUNY Steinman Hall 134, 160 Convent Avenue, New York, NY 10031, USA 2 Department of Civil and Environmental Engineering, Institute of Transportation Studies University of California, Irvine, Irvine, CA 92697-3600, USA 3 Urban Planning Group, Eindhoven University of Technology P.O. Box 513, Vertigo 8.18, 5600 MB, Eindhoven, Netherlands