Geographical clustering and the evaluation of cluster policies: introduction

The article introduces the special section on “Geographical Clustering and the Evaluation of Cluster Policies”. We first provide a motivation of cluster policies and briefly review the state of the art in cluster evaluation research. We proceed with summaries of the papers comprising the special section, which take different perspectives and cover distinct facets of cluster policy evaluation. The papers identify challenges for evaluation by highlighting the variety of approaches towards cluster policies addressed at different policy levels. Additional challenges for an identification of policy impact result from the complexity as well as the timing of policy effects. Thus, proper evaluations should employ and combine a broad set of evaluation methods. Based on the main lessons learned, we finally propose several avenues for future research to cope with these challenges.