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Aims and objectives: To characterise the intratheoretical interests of knowledge in nursing science as an epistemological framework for fundamental care. Background: For Jürgen Habermas, theory does not separate knowledge interests from life. All knowledge, understanding and human research is always interested. Habermas formulated the knowledge interests in empirical‐analytical, historical‐hermeneutic and critical social sciences; but said nothing about health sciences and nursing science. Design: Discursive paper. Results: The article is organised into five sections that develop our argument about the implications of the Habermasian intratheoretical interests in nursing science and fundamental care: the persistence of a technical interest, the predominance of a practical interest, the importance of an emancipatory interest, “being there” to understand individuals’ experience and an “existential crisis” that uncovers the individual's subjectivity. Conclusions: The nursing discipline can take on practical and emancipatory interests (together with a technical interest) as its fundamental knowledge interests. Nurses’ privileged position in the delivery of fundamental care gives them the opportunity to gain a deep understanding of the patient's experience and illness process through physical contact and empathic communication. Relevance to clinical practice and nursing research: In clinical, academic and research environments, nurses should highlight the importance of fundamental care, showcasing the value of practical and emancipatory knowledge. This process could help to improve nursing science's leadership, social visibility and idiosyncrasy. [ABSTRACT FROM AUTHOR]

The Habermasian concept of 'interest' has had a profound effect on the characterization of scientific disciplines. Going beyond issues unrelated to the theory itself, intra-theoretical interest characterizes the specific ways of approaching any science-related discipline, defining research topics and methodologies. This approach was developed by Jürgen Habermas in relation to empirical-analytical sciences, historical-hermeneutics sciences, and critical sciences; however, he did not make any specific references to health sciences. This article aims to contribute to shaping a general epistemological framework for health sciences, as well as its specific implications for the medical and nursing areas, via an analysis of the basic knowledge interests developed by Habermas. [ABSTRACT FROM AUTHOR]