JNUR_V6_N1_A1 Layla Rahim Journal on Nursing 2231–4504 6 1 1 5 Science of Unitary Human Being, Human Energy Model, Nursing This article is focused on the major features of the Martha Rogers grand theory and Susan Leddy's Human Energy Model, a middle range theory. Roger's theory talks about Human being and the environment as energy fields, while Leddy's Human Energy Model explains the three aspects of universal essence: matter, information and energy. The article is based on a real case scenario. The aim of this paper is to compare the above mentioned theorists, impact on the outcomes and their relationship with the clinical scenario in their own approaches. February – April 2016 Copyright © 2016 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=5914