Perspectives on the modeling of spatial dynamics

Modeling spatial dynamics refers to a formalization process which takes into account changes of space according to certain temporalities. The expression makes sense for all scientists working in the field of geographical science. But each of these terms refers to different representations and practices according to the discipline. Starting from the different models presented in the articles of this volume, we discuss the diversity of points of views which coexists on these notions. A first question concerns what is effectively represented in the model: states, trajectories, events or processes of change. Concerning "models" it appears that the points of view are influenced by the disciplinary background of the scientists. We then present a descriptive frame for disambiguating models' description as well as the categories used by the group on the role of space and the objective of the model. At last we discuss the comparative perspective which is adopted in most articles of this volume.