“…It is today widely accepted that European Territorial Cooperation (ETC) constitutes one of the cornerstones of European integration (Knippenberg, 2004;Perkmann, 2003). EU macro-regional strategies are the most recent addition to this toolbox of functional cooperation in a territorial context (Dühr, 2011(Dühr, , 2018Gänzle & Kern, 2016a, 2016bMetzger & Schmitt, 2012;Schuh et al, 2015;Sielker, 2016;Stead, 2011Stead, , 2014aStead, , 2014b. Although geographically focused on a 'macro-region', such as the Baltic Sea, these strategies have been devised to address specific challenges and opportunities, and to promote mutual learning processes through 'experimenting' (Gänzle, 2017b;Gänzle & Mirtl, 2017a, 2017b with new governance architectures.…”