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The empirical analysis in this paper highlights that joint activityâtravel episodes warrant scrutiny for enhancing travelâdemand models. The MNL model results indicate significant impacts of socioeconomic characteristics of individuals on companion- type choices for leisure activities. The impacts of transportation sys- tem characteristics and land use patterns on these choices are not examined for want of data. This is an avenue for further research. REFERENCES Arentze, T., and H. Timmermans. 2006. Social Networks, Social Interactions, and ActivityâTravel Behavior: A Framework for Microsimulations. Presented at 85th Annual Meeting of the Transportation Research Board, Washington, D.C. Axhausen, K. W. 2005. Social Networks and Travel: Some Hypothesis. In Social Aspects of Sustainable Transport: Transatlantic Perspectives (K. Donaghy, S. Poppelreuter, and G. Rudinger, eds.), Ashgate Publishing Limited, United Kingdom. Carrasco, J., and E. J. Miller. 2006. Exploring the Propensity to Perform Social Activities: A Social Networks Approach. Presented at 85th Annual Meeting of the Transportation Research Board, Washington, D.C. Carrasco, J., B. Hogan, B. Wellman, and E. J. Miller. 2006. Collecting Social Network Data to Study Social Activ- ityâTravel Behavior: An Egocentric Approach. Presented at 85th Annual Meeting of the Transportation Research Board, Washington, D.C. Gliebe, J. P., and F. S. Koppelman. 2002. A Model of Joint Activity Participation Between Household Members. Transportation, Vol. 29, No. 1, pp. 49â72. Goulias, K. G., and T. G. Kim. 2005. An Analysis of Activity- Type Classification and Issues Related to the With Whom and For Whom Questions of an Activity Diary. In Progress in Activity- Based Analysis (H. J. P. Timmermans, ed.), Else- vier, Oxford, England. Kemperman, A., T. Arentze, and H. J. P. Timmermans. 2006. Social Commitments and ActivityâTravel Scheduling Deci- sions. Presented at 85th Annual Meeting of the Trans- portation Research Board, Washington, D.C. Srinivasan, S., and C. R. Bhat. 2006. A Multiple Discrete Con- tinuous Model for Independent and Joint Discretionary Activity Participation Decisions. Transportation: Planning, Policy, Research, Practice, Vol. 33, No. 5, pp. 497â515. Vovsha, P., E. Peterson, and R. Donnelly. 2003. Explicit Mod- eling of Joint Travel by Household Members: Statistical Evidence and Applied Approach. In Transportation Research Record: Journal of the Transportation Research Board, No. 1831, Transportation Research Board of the National Academies, Washington, D.C., pp. 1â10. 136 INNOVATIONS IN TRAVEL DEMAND MODELING, VOLUME 2