Practising theory: When theory affects urban planning

This article starts from the premise that, for all its diverse ideals and technical bases, the core of planning is an ability to favourably influence collective spatial concerns. The location of practice within spatial governance means that the ‘worth ’ of planning theories often depends upon the nature of governance itself in given places and times. In this article, three layered vignettes of practice in Victoria, Australia are presented to demonstrate the importance of governance settings to the value and success of selected planning theories at different geographical and temporal scales. The vignettes examine: the introduction of new planning legislation in Victoria, Australia; the take-up of medium density housing; and the influence of communicative planning on participation. The article concludes that the effects of theory upon practice depend upon institutional circumstances, and that theory, and its users, must address this to be effective and to prevent unintended outcomes