Migrational flows as recorded in the census are a heterogeneous mixture of sets of movements responding in quite different ways to area characteristics and to the friction of distance. To model such flows requires a multistream approach reflecting the principal options in the decision tree facing prospective residential or workplace movers. In this paper an existing three-stream model of migration is adopted and extended to provide a first representation of district-district flows within Great Britain in 1980-81. The extended model incoporates an option for propective migrants to choose commuting rather than a residential move after finding a new workplace, and employs a logistic function of distance in the regional or environmental stream where migrational opportunities tend not to be independent. -Author

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residential mobility Research Methodology logistic function multistream model population Migrants demography Europe Northern Europe Population Dynamics Migration, Internal Developed Countries UK Great Britain Residence Characteristics Temporary Migration spatial distribution geography Behavior theoretical model Models, Theoretical Article Transportation migration traffic and transport Geographic Factors United Kingdom developed country Demographic Factors census research Emigration and Immigration commuting Transients and Migrants Distance decision making Health Services Accessibility health care delivery