Original ArticlesExercising Nursing Essential and Effective Freedom in Behalf of Social Justice A Humanizing ModelPerry, Donna J. PhD, RN; Willis, Danny G. DNS, RN, PMHCNS-BC; Peterson, Kenneth S. PhD, FNP-BC; Grace, Pamela J. PhD, RN, FAANAuthor Information University of Massachusetts Worcester Graduate School of Nursing (Drs Perry and Peterson); and Boston College William F. Connell School of Nursing, Chestnut Hill, Massachusetts (Drs Willis and Grace). Correspondence: Donna J. Perry, PhD, RN, University of Massachusetts Worcester Graduate School of Nursing, 55 Lake Ave North, Worcester, MA 01655 (DonnaJ.Perry@umassmed.edu). 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: July/September 2017 - Volume 40 - Issue 3 - p 244-262 doi: 10.1097/ANS.0000000000000151 Buy Metrics Abstract This article expands upon previous work by the authors to develop a model of nursing essential and effective freedom to facilitate nursing action in behalf of social justice. The article proposes that while social justice is rooted in nursing's ontological, epistemological, and moral foundations, the discipline's social justice mandate is constrained by its historical and contemporary location within an institutionalized medical paradigm. We present a model of nursing “essential” and “effective” freedom based on the philosophy of Bernard Lonergan to illustrate how nursing can transcend these barriers. This humanizing model is illustrated through personal narratives of the authors. © 2017 Wolters Kluwer Health, Inc. All rights reserved.