Abstract
The Attractivity Model, which has been presented in this paper, is deduced from the laws of probability. By an attractivity value the characteristics of a trip alternative are summarized, relative to those of other alternatives with reference to travel behaviour of individuals and to postulated random values in the land use pattern and the transportation network. The model has relationship with previous models and most of them can be referred to the terms of the Attractivity Model. The quality of forecasting will depend in this model on the expression of the attractivity values.