In The New Science of Cities, Michael Batty reframes the city not simply as a physical place but as a dynamic system of networks and flows. He argues that understanding urban space requires understanding the movements—of people, information, capital, and activities—that shape it, and that these movements are themselves rooted in the networks that organise urban life. Drawing on complexity science, social physics, urban economics, transportation theory, and urban geography, Batty introduces a set of ideas and methods that uncover the deep structures behind how cities operate.
He outlines the foundations of this “new science,” explaining how flows emerge, how networks form, and how these patterns scale from urban blocks to entire regions. Batty examines the size and internal order of cities, the transport routes that define their connectivity, and the spatial anchors that stabilise these networks. He also presents a range of modelling approaches—from stochastic simulations to bottom-up evolutionary systems—that help explain current urban dynamics and anticipate future ones. Ultimately, his work highlights a central principle: cities are shaped through collective action, and understanding their networks is essential for designing and governing them.