Civic education and citizen science: definitions, categories, knowledge representation / Luigi Ceccaroni, Anne Bowser, Peter Brenton -- More than just networking for citizen science: examining core roles of practitioner organizations / Claudia Göbel [and 4 others] -- SciStarter 2.0: a digital platform to foster and study sustained engagement in citizen science / Catherine Hoffman [and 4 others] -- What drives citizens to engage in ICT-enabled citizen science?: case study of online amateur weather networks / Mohammad Gharesifard, Uta Wehn -- The social function of citizen science: developing researchers, developing citizens / Luis Arnoldo Ordóñez Vela [and 3 others] -- Geographical information systems in modern citizen science / Laia Subirats, Joana Simoes, Alexander Steblin -- Citizen science and its role in sustainable development: status, trends, issues, and opportunities / Hai-Ying Liu, Mike Kobernus -- Social context of citizen science projects / Patricia Tiago -- Citizen observatories as advanced learning environments / Josep M. Mominó, Jaume Piera, Elena Jurado -- The Role of citizen science in environmental education: a critical exploration of the environmental citizen science experience / Ria Ann Dunkley -- Citizen-driven geographic information science / Thomas J. Lampoltshammer, Johannes Scholz -- Can citizen science seriously contribute to policy development?: a decision maker's view / Colin Chapman, Crona Hodges -- Smart activation of citizens: opportunities and challenges for scientific research / Maria Gilda Pimentel Esteves [and 4 others] -- Surface water information collection: volunteers keep the Great Lakes great / Mark Gillingham.