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This analysis of Fawcett’s ideas will situate the role played by her model in the discipline in relation to its organization of knowledge and its role in the move to institutionalize the nursing discipline. By providing an in-depth epistemological analysis, locating the relationships between this concept and Popper’s work, and showing how Fawcett draws on a specific vision of science, the article presents a fresh look at the model while situating it within its assumptions. It also addresses some of its limitations and draws conclusions about its role in the move to institutionalize the nursing discipline.