Multiple nuclei model

The multiple nuclei model of Chauncy Harris and Edward Ullman from 1945 belongs next to the ring model of Ernest Burgess ( 1925/1929 ) and the sector model of Homer Hoyt (1939 ) to the classic models of urban development. Unlike their predecessors, Harris and Ullman assume that the size of the city increases, the number of their nuclei. While Hoyt and Burgess defined the city center as a single core of a city, and peripherally located business centers ( eg shopping centers ), cultural centers or parks are regarded as such in multi- cores model. The different cores of a city characterized by mostly different uses and vary in size and importance. Due to its assumption that a city has several areas of central place functions, this model of reality is more equitable than that of Burgess and Hoyt. Criticism is, however, that Harris and Ullman the term "core " so that is the center meant have not defined precisely in this context.