“…Experimental and quasi-experimental studies are considered the ''golden standard'' for establishing effects of a certain intervention (cf., Petticrew & Roberts, 2006;Vandenbroucke, 2004;Vandenbroucke, 2008), and thus might be plead for to establish the effects of well-developed and well-documented curricular practices in the area of citizenship education. In our review, some studies investigated the intended and predicted effects of a given curriculum on students' citizenship (e.g., Feldman et al, 2007;McDevitt & Kiousis, 2007;Yang & Chung, 2009); others investigated learning outcomes for a -sometimes already existing -citizenship curriculum in a more open and exploratory manner (e.g., Finkel & Ernst, 2005;Lopez et al, 2009;Torney-Purta et al, 2007). Taking the applied research designs into account, we thus interpret these results as only indicating ''what might work'' rather than as evidence.…”