The Focus of the DisciplinePerspectives on the Unitary Transformative Person-Environment-Health Process for the Knowledge Base of NursingSmith, Mary Jane PhD, RN, FAAN; Fitzpatrick, Joyce J. PhD, MBA, RN, FAANAuthor Information School of Nursing, West Virginia University, Morgantown (Dr Smith); and Frances Payne Bolton School of Nursing, Case Western Reserve University, Cleveland, Ohio (Dr Fitzpatrick). Correspondence: Mary Jane Smith, PhD, RN, FAAN, School of Nursing, West Virginia University, Morgantown, WV 26506 (email@example.com). The authors have disclosed that they have no significant relationships with, or financial interest in, any commercial companies pertaining to this article. Advances in Nursing Science: January/March 2019 - Volume 42 - Issue 1 - p 43-57 doi: 10.1097/ANS.0000000000000250 Buy Metrics Abstract Nursing knowledge development continues to face significant challenges, as there is not yet widespread acceptance of the important role of nursing theory in research, education, and professional practice. The purpose of this article is to describe perspectives on person, environment, health from different levels of knowledge development for the discipline of nursing. The authors recommend continued discourse among nurse scholars to advance the discipline of nursing globally. © 2019 Wolters Kluwer Health, Inc. All rights reserved.