conference paper Activity-based approaches to modeling complex travel behavior: Issues and challenges Proceedings, Transportation Planning Research Colloquium Publication Date January 1, 1983 Author(s) Will Recker, Gregory Root, Michael McNally Suggested Citation W. W. Recker, G. S. Root and M. G. McNally (1983) “Activity-based approaches to modeling complex travel behavior: Issues and challenges”, in Proceedings, Transportation Planning Research Colloquium. Delft.