viduals make. It is a dialogue between ideas concerning form and process in which a theory of explanation provides the rules for structuring information and making interpretive inferences. It is of critical importance, then, to know not only what these rules are, but also why they are effective for answering specific classes of questions. As Ulam [113] has recently pointed out, diagrammatic (or mapped) representations of residential patterns can be generated by simple sets of rules, these rules constituting an explanation of the form, so to speak. At the same time, however, given only the pattern, there is in general no unique means for making inferences about the specific behaviors that gave rise to it, that is, to explain the process of migration. To do this, movement behavior must be considered as a sequence of individual decisions and the explanation given in terms of the association between residential choices and changes in social and economic conditions.
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Stephen Gale (1973) studied this question.