Isard’s contributions to spatial interaction modeling

Abstract.

This short review, surveys Isard’s role in promoting what has become known as spatial interaction modeling. Some contextual information on the milieu from which his work emerged is given, together with a selected number of works that are judged to have been influenced (directly and indirectly) by his work. It is suggested that this burgeoning field owes a lot to the foundations laid in the gravity model chapter of “Methods”. The review is supplemented by a rather extensive bibliography of additional works that are indicative of the breadth of the impact of this field.