Planning Theory has a history of common debates about ideas and practices and is rooted in a critical concern for the 'improvement' of human and environmental well-being, particularly as pursued through interventions which seek to shape environmental conditions and place qualities. This three-volume set provides an authoritative collection, in an accessible form, of the most important and influential articles and papers on planning theory. While acknowledging that this discipline draws on a diverse range of intellectual inspirations and influences, the papers included are specifically focussed on the planning field. These volumes are organised in a broadly chronological sequence, with major bodies of thought grouped together. Each volume includes a substantial introduction reviewing the specific content of that volume and brief introductions are also provided for each section within the volumes.