The challenge of making cities more sustainable is one of the major constraints that has to be addressed at all political levels. Many innovative planning solutions are now underway in various European cities of any scale. One way of making the transition to low-carbon cities happen is the approach of replicat- ing successful demonstration projects. During several years of participatory observation in European projects and municipal consultancy as well as through qualitative interviews with municipal technical staff working on climate change, we observed that replication is seen by the European Commission as well as national governments as a major solution for speeding up the transition EU wide. The research includes an evaluation of already funded EU projects using a replication approach. It is commonplace that replication is not likely to happen 1:1, because each city has its own challenges. Nonetheless, the process behind replication attempts leads to considerable learning effects. We found out that learning from good examples serves several purposes for managing the transition, e.g. inspiration and motiva- tion of technical staff, mobilisation of stakeholders or political commitment. The paper concludes with an analysis of success factors and barriers for replication drawing on real life examples. The find- ings recommend making supporting schemes more effective by evolving the concept of unstructured replication towards a mentoring approach based on scientific steering.
climate change, good practice, learning, mentoring, replication, urban sustainability transition.
 Voytenko, Y., McCormick, K., Evans, J. & Schliwa, G., Urban living labs for sustain- ability and low carbon cities in Europe: towards a research agenda. Journal of Cleaner Production, 123, pp. 45–54, 2016. https://doi.org/10.1016/j.jclepro.2015.08.053
 European Union(EU), PactofAmsterdam, 2016, availableathttp://urbanagendaforthe.eu/ wp-content/uploads/2016/05/Pact-of-Amsterdam_v7_WEB.pdf (accessed 3 February 2017)
 Longworth, N., Learning Cities, Learning Regions, Learning Communities: Lifelong Learning and Local Government, Routledge: London, New York, 2006.
 Bulkeley, H., Urban sustainability: learning from best practice? Environment and Planning A, 38(6), pp. 1029–1044, 2006. https://doi.org/10.1068/a37300
 Stead, D., Best practices and policy transfer in spatial planning. Planning Practice and Research, 27(1), pp. 103–116, 2012. https://doi.org/10.1080/02697459.2011.644084
 Vreugdenhil, H., Taljaard, S. & Slinger, J.H., Pilot projects and their diffusion. A case study of integrated coastal management in South Africa. International Journal of Sustainable Development, 15(1/2), pp. 148–172, 2012. https://doi.org/10.1504/IJSD.2012.044039
 Hartley, J. & Allison, M., Good, better, best? inter-organizational learning in a network of local authorities. Public Management Review, 4(1), pp. 101–118, 2002. https://doi.org/10.1080/14616670110117332
 Francis, G. & Holloway, J., What have we learned? themes from the literature on best-practice benchmarking. International Journal of Management Reviews, 9(3), pp. 171–189, 2007. https://doi.org/10.1111/j.1468-2370.2007.00204.x
 Tedesco, C., EU and urban regeneration ‘good practices’ exchange. from download to upload Europeanization? In The Europeanisation of Cities. Policies, Urban Change, and Urban Networks, A. Hamedinger & A. Wolffhardt (eds.), Techne Press: Amsterdam, pp. 183–195, 2010.
 Rose, R., What is lesson-drawing? Journal of Public Policy, 11(1), pp. 3–30, 1991. https://doi.org/10.1017/S0143814X00004918
 Rose, R., Lesson-Drawing in Public Policy. A Guide to Learning Across Time and Space, Chatham House: Chatham NJ, 1993.
 Dolowitz, D. & Marsh, D., Who learns what from whom: a review of the policy transfer literature. Political Studies, 44(2), pp. 343–357, 1996. https://doi.org/10.1111/j.1467-9248.1996.tb00334.x
 Dolowitz, D. & Marsh, D., Learning from abroad: the role of policy transfer in contem- porary policy-making. Governance, 13(1), pp. 5–24, 2000. https://doi.org/10.1111/0952-1895.00121
 Peck, J. & Theodore, N., Mobilizing policy: models, methods, and mutations. Geoforum,
41(2), pp. 169–174, 2010. https://doi.org/10.1016/j.geoforum.2010.01.002
 McCann, E. & Ward, K. (eds.), Mobile Urbanism. Cities and Policymaking in the Global Age, University of Minnesota Press: Minneapolis, 2011.
 Rogers, E.M., Diffusion of Innovations, Free Press: New York, 1996 .
 Overman, S. & Boyd, K., Best practice research and postbureaucratic reform. Journal of Public Administration Research and Theory, 4(1), pp. 67–84, 1994.
 Bardach, E., Creating compendia of “Best Practice”. Journal of Policy Analysis and Management, 22(4), pp. 661–665, 2003. https://doi.org/10.1002/pam.10160
 Radaelli, C., The diffusion of regulatory impact analysis: Best practice or lesson-draw- ing? European Journal of Political Research, 43(5), pp. 723–747, 2004. https://doi.org/10.1111/j.0304-4130.2004.00172.x
 Veselý, A., Theory and methodology of best practice research: A critical review of the current state. Central European Journal of Public Policy, 5(2), pp. 98–117, 2011.
 Rotmans, J. & Loorbach, D.A., Managing transitions for sustainable development. In Understanding Industrial Transformation, X. Olsthoorn & A.J. Wieczorek (eds.), Kluwer Academic Publishers: Dordrecht, pp. 187–206, 2006.
 Lachman, D.A., A survey and review of approaches to study transitions. Energy Policy
58, pp. 269–276, 2013. https://doi.org/10.1016/j.enpol.2013.03.013
 European Union (EU), Making Europe’s cities smarter, 2013. Available at: http:// europa.eu/rapid/press-release_IP-13-1159_en.htm (accessed 3 February 2017)
 European Commission, Triangulum: The three point project. Demonstrate, disseminate, replicate, 2016. Available at: http://cordis.europa.eu/project/rcn/194459_en.html and http://triangulum-project.eu/ (accessed 14 February 2017).
 European Commission, REMOURBAN: Regeneration Model for accelerating the smart URBAN transformation, 2017. Available at: http://cordis.europa.eu/project/ rcn/194449_en.html and http://www.remourban.eu/ (accessed 14 February 2017)
 European Commission, GrowSmarter, 2016. Available at: http://cordis.europa.eu/proj- ect/rcn/194441_en.html and www.grow-smarter.eu/home/ (accessed 14 February 2017)
 European Commission, Replicate: Renaissance of Places with Innovative Citizenship and Technology, 2016. Available at http://cordis.europa.eu/project/rcn/200256_en.html and http://replicate-project.eu/ (accessed 14 February 2017)
 European Commission, SmartEnCity: Towards Smart Zero CO2 Cities across Europe, 2016. Available at: http://cordis.europa.eu/project/rcn/200259_en.html and http://
smartencity.eu/ (accessed on: 14 February 2017).
 European Commission, Sharing Cities, 2016. Available at: http://cordis.europa.eu/proj- ect/rcn/200153_en.html and http://www.sharingcities.eu/ (accessed 14 February 2017)
 European Commission, Smarter Together: Smart and Inclusive Solutions for a Better Life in Urban Districts, 2016. Available at: http://cordis.europa.eu/project/rcn/199963_ en.html and http://smarter-together.eu/. (accessed 14 February 2017)
 Climate-KIC, About Us. Available at: www.climate-kic.org/about/ (accessed 14 February 2017).
 Climate-KIC, Transition Cities. Available at: http://www.climate-kic.org/projects/tran- sition-cities/ (accessed 14 February 2017)
 Vettoretto, L., A preliminary critique of the best and good practices approach in European spatial planning and policy-making. European Planning Studies, 17(7), pp. 1067–1083, 2009. https://doi.org/10.1080/09654310902949620
 Antonini, E., Gaspari, J. & Boulanger, S.O.M., Multi-layered urban strategies to foster the smart cities development. WIT Transactions on Ecology and the Environment, 194, WIT Press: Southamption, pp. 23–24, 2015.
 Szulanski, G., Exploring internal stickiness: Impediments to the transfer of best prac- tice within the firm. Strategic Management Journal, 17(2), pp. 27–43, 1996. https://doi.org/10.1002/smj.4250171105
 Wolman, H. & Page, E., Policy transfer among local governments: An information- theory approach. Governance, 15(4), pp. 477–501, 2002. https://doi.org/10.1111/1468-0491.00198
 Forester, J., Bounded rationality and the politics of muddling through. Public Administration Review, 44(1), pp. 23–31, 1984. https://doi.org/10.2307/975658
 Macmillen, J. & Stead, D., Learning heuristic or political rhetoric? Sustainable mobility and the functions of ‘best practice’. Transport Policy, 35, pp. 79–87, 2014. https://doi.org/10.1016/j.tranpol.2014.05.017
 Nagorny, N., Leading the way with examples and ideas? Governing climate change in German municipalities through best practices. Journal of Environmental Policy and Planning, submitted for publication.
 European Commission, CityKeys: Smart City performance measurement system, 2016. Available at: http://cordis.europa.eu/project/rcn/194438_en.html and http://citykeys- project.eu/ (accessed 14 February 2017)