Abstract
In this paper, the philosophical assumptions for theorizing and re search based on the Roy adaptation model of nursing are explicated. The common philosophical heritage of nursing and the author's perspec tive of the discipline are examined. Some highlights of the developments of the Roy adaptation model are reviewed. Eight assumptions about the adapting person in society are articulated, derived from the theorist's nursing heritage, perspective of the discipline, and specific life values. The philosophical assumptions are categorized by the general principles of humanism and veritivity, a term coined to connote the richness of rootedness in an absolute truth. This principle is compared to rational ism and relativism as two other world views. The author describes how veritivity as a world view leads to the values of conviction, commitment, and caring based on the value of the individual in society in the context of the purposefulness of all of human existence.

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