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A nursing theory is a set of concepts, definitions, relationships, and assumptions or propositions derived from nursing models or from other disciplines and project a purposive, systematic view of phenomena by designing specific inter-relationships among concepts for the purposes of describing, explaining, predicting, and /or prescribing. In other words, Nursing theory is "an organized framework of concepts and purposes designed to guide the practice of nursing".

Borrowed theory is defined as knowledge developed by other disciplines and is adapted in the discipline of nursing. The value of a borrowed or shared theory is that it allows nursing to interpret, add, expand, and validate it in nursing situations. The lack of comprehensive substantive nursing theories has resulted in nursing borrowing theoretical assumptions, concepts, and research instruments from other disciplines such as anthropology, sociology, psychology, and education and adopting concepts and propositions from other paradigms, such as psychoanalysis, development, adaptation, and humanism.

When borrowed concepts and theories are utilized, they must be redefined and resynthetized in accordance with the perspective of the borrowing discipline.
T/b pg 46: Nursing "borrows" or "shares" theories and concepts from other disciplines to guide theory development, research and practice. It is critical that nurses redefine and synthesize these shared concept and theories according to a nursing perspective. The concepts of nursing, person, environment and health are widely accepted as the dominant phenomena in nursing.