Opening up the Compendium: An Evaluation of International Comparative Planning Research Methodologies

It is two decades since the European Compendium of Spatial Planning Systems and Policies was conceived. Since its publication in 1997, the Compendium has become a widely cited reference in comparative planning literature.¹ It remains one of the few comprehensive reviews of spatial planning policy and practice across western Europe. The Compendium also represents one of the few studies to develop a typology for distinguishing between national planning systems. A number of comparative research studies on spatial planning have since built on the methodological foundations laid by the Compendium although its typology of national planning systems is not always used or interpreted as originally intended for a variety of reasons. In the context of extensive reform of planning approaches in Europe, the paper examines what can be learned about methodologies for international comparative research in planning based on the experience of the Compendium study and subsequent major comparative planning studies. We conclude that while broad typologies remain useful in explaining general trends, they may hide as much as they reveal. Future studies should widen the criteria used to build ideal types beyond formal characteristics in order to address planning in practice.