The Multiple Nuclei Model

Chauncy Harris and Edward Ullman introduced the model in their 1945 article, 'The Nature of Cities,' arguing that the traditional single-center model was insufficient for post-industrial urban landscapes.

The model is frequently applied to large, decentralized North American cities where distinct suburban nodes have emerged as major employment and commercial centers.

Developed to address the limitations of the concentric zone and sector models, the multiple nuclei model acknowledges that cities evolve around various centers of activity, such as ports, universities, or industrial parks.

This model provides a framework for urban planners to analyze how specialized economic activities influence the spatial distribution of populations and infrastructure.

The model relies on four principles: certain activities require specialized facilities, similar activities cluster together for mutual benefit, certain activities repel each other, and some activities cannot afford the high rent of the most desirable locations.