Planning Theory is an international ISI-indexed, peer-reviewed forum for exploring ideas concerned with a broad conception of spatial planning. The Editors welcome intellectually diverse contributions that advance planning theory understanding and debate.There exists a broad range of views about what planning theory is and could, or should, be. This reflects an equally diverse range of views about the processes and products of planning as practised in different parts of the world. One of the roles of Planning Theory as a journal is to work through the agreements and tensions between views by publishing quality papers presenting, for instance, strong theoretical arguments, innovative ways of thinking, new ways of applying theory and so on.