Beyond the divide: evaluation in co-evolutionary spatial planning

Spatial developments are becoming increasingly a-linear and dynamic with a wide range of possible actors. The awareness of uncertainty is growing and, therefore, projects need to integrate a high level of flexibility. But simultaneously, there is a growing demand for more informed and well-argued decisions. Predictions from the ‘best estimated model’ are no longer credible nor accepted, being too fragile and uncertain. How can we keep long-lasting, multi-actor projects in permanent transition on track? This expresses an important demand for more integrated evaluation in spatial planning. In this respect, this paper analyses existing theoretical evaluation strategies and how these strategies deal with spatial developments. They are still usually structured along static, generic and circular approaches; in fact, many neglect the dynamic, plural and a-linear realities. Therefore, this paper develops a post-structural evaluation approach for various planning issues and different playing fields of actors, followed by an illustration of the various settings for this approach in a Flemish case. Finally, we discuss how spatial planning and future plans might be evaluated with a dissipative role for evaluation.