Abstract
The article combines a criticism of public understanding of science with the sociology of expectations to examine how particular expectations toward scientific progress have performative effects for the construction of publics as citizens of science. By analyzing a particular controversy about gene therapy in Denmark, the article demonstrates how different sets of expectations can be used to discriminate among three different assemblages: the assemblage of consumption, the assemblage of comportment, and the assemblage of heroic action. Each of these assemblages makes medical science, scientific citizenship, politics, patients, doctors, and expectations toward the future emerge in particular ways. By their radically different expectations toward science and their different constructions of what it means to be a scientific citizen, the assemblages construct the objectives of the governance of science in three very different ways.