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This article examines the terms science, discipline and knowledge from the perspective of the use and advancement of knowledge in the discipline of nursing. It views the notion of organized knowledge as the foundation of a science as well as considering the use of scientific methods as imperative in any discipline that aims to contribute to the world of ideas by relying on rationality. This paper aims to trace the link between science and nursing science, to clarify scientific issues for nursing, and to begin thinking about understanding the concept of diversity and the effective contribution of doctoral training in nursing as a guarantee of the future evolution of this discipline.