Little is known about the paths a migrant follows between the time he reaches the city and the time he settles into a secure and stable dwelling environment. An evolutionary model is presented which lays stress upon the relations of migrant behaviour and intraurban structure as it evolves through phases of sustained urbanization. The model is depicted as a set of changing relations between the intraurban relocation of low-income migrants and intraurban structure during 3 phases of sustained urbanization - early, continuing, and later phases. Then, utilizing data from Mexico City and Port of Spain, Trindad, empirical evidence is presented to support the major themes of the model. -after Author

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