 There is some affiliation of Poznań with the European structuralist account of theories, based on a set-theoretical analysis of theory structure and theory relations. Kuhn himself was much attracted to Joseph Sneed’s approach (Sneed 1971), soon extended by Wolfgang Stegmüller (1974/1976) and others. Given the informality of Kuhn’s own approach and his explicit shunning of rules and rational reconstructions, his attraction to the structuralist line was initially puzzling. However, the structuralists were and are interested in intertheory relations, and models are central to their non-sentential conception of theories. These are models in the formal sense, but Kuhn found insightful connections to his own use of models in the form of exemplars. For both Kuhn and the structuralists it is the collection of exemplars or models, not an abstract statement of a theory, that carries the weight in scientific inquiry.