The Four Step Model

@inproceedings{McNally2007TheFS,
  title={The Four Step Model},
  author={Michael G. McNally},
  year={2007}
}
The history of demand modeling for person travel has been dominated by the modeling approach that has come to be referred to as the four step model (FSM) (see Chapter 2). Travel, always viewed in theory as derived from the demand for activity participation, in practice has been modeled with trip-based rather than activity-based methods (as presented in Chapter 4). Trip origin-destination (O-D) rather than activity surveys form the principle database. The influence of activity characteristics… 
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