PURPOSE: To analyze and clarify the conceptual basis of advanced practice nursing to determine the state of the knowledge from the perspective of four overarching principles derived from the philosophy of science: epistemological, pragmatic, linguistic, and logical. DATA SOURCES: Written discourse regarding advanced practice nursing from refereed journals published between 2000 and 2007. CONCLUSIONS: Conceptualization of a core definition of advanced practice nursing will enhance external legitimacy and recognition; understanding advanced practice nurse (APN) roles, sub-roles, and competencies will enhance internal cohesion. The outcome of this concept analysis is a greater understanding of the conceptual basis of advanced practice nursing and a current best estimate of the probable truth surrounding advanced practice nursing. IMPLICATIONS FOR PRACTICE: A greater understanding of the conceptual basis of advanced practice nursing will help to gain clarity, internal cohesion, external legitimacy, and acceptance of APN roles by society and other healthcare professions.
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