Eight site-visits to existing systems are scheduled between June 2011 and May 2012, e.g., United Kingdom, France and Denmark/Sweden. Open to 6Á10 project partners and participants from all European countries, the visits offer an in-depth understanding of a variety of systems and facilitate knowledge transfer, through discussions on practical experiences with national and regional stakeholders (e.g., strengths and weaknesses of the systems, lessons learned from the operators and users and expectations of decision makers).