The re:innovate track highlights different perspectives on Open Innovation. This session presents challenges of the public administration for the civil society. Open Cities "Open Innovation Mechanisms in Smart Cities (Open Cities)" started as EU funded project in the end of 2010. Within the project the participating administrations, research institutions and companies support Open Government activities. The partners from the European major cities Helsinki, Berlin, Amsterdam, Paris, Rome, Barcelona and Bologna transfer methods of Open Innovation -- like Crowdsourcing, Open Data, Fibre to the Home and Open Sensor Networks -- to the public sector and validate the success of the methodologies within pilot projects. Open Cities App Challenge -- Prof. Dr. Ina Schieferdecker Within the scope of the Pan-Europian "Open Cities"-project the Berlin Senate Administration for Economics, Technology and Research supports the open call for the Open Cities App Challenge. This call is directed to all developers and organizations with innovative products or services that uses open data (from the Open Cities open data platform or the Open Cities open sensor platform or any other open data source) and solves a real problem in citizens' every day urban life. Prof. Dr. Ina Schieferdecker presents the challenge, informs about the terms and conditions and calls on to every interested developer to contribute. For further informations check here or the portal. Open Cities Crowdsourcing Challenge -- Esteve Almirall The second Open Cities Challenge that adresses the European audience targets developers and everybody who is interested or engaged in the field of Open Data. Open Cities asks them for their proposals on what kind of data the developers and interested activists would like to see released. This is something that has not been done before and aims to increase the attention and awareness for opening public data. Prof. Esteve Almirall from Barcelona will announce the challenge and presents background, terms and conditions of that call.