Behavior mapping is the systematic observation of people using their environments. The Smart Social Spaces research project, recently completed in Sydney, Australia, is used as a vehicle to illustrate the usefulness of this method for understanding the relationships between people and public spaces in cities. Behavior mapping was the central method used to establish what impact the inclusion of smart technology and street furniture had on people’s use of two public spaces. Using this method, it is possible to record real-time patterns of people’s use of public space, enabling local authorities to better support the social use of public space and the management of its infrastructure.