Nursing TheoriesA nursing theory is an innovative product of nurses who seek to thoughtfully explain aspects of nursing in a way that can be studied, evaluated, and used by other nurses (Sitzman and Eichelberger, 2010). Nursing theorists are people who are, or have been, nurses and who have thought about how the phenomenon of nursing might be described (Sitzman & Eichelberger, 2010). Each theorist then attempted in their own way to document their reflections and observations based on professional and personal experiences (Sitzman & Eichelberger, 2010). Theories are important in that they provide structure and order to guide and improve professional practice, teaching, learning activities, and research (Sitzman and Eichelberger, 2010). Each theory is as unique as the individuals who developed it (Sitzman & Eichelberger, 2010). In this article, nursing theorists Martha Rogers and Dorothea Orem are analyzed in the context of their theory, questions, key assumptions, and the four key concepts of the nursing metaparadigm: person, environment, health, and nursing ( Meleis, 2011a). Each theorist will then be compared on the similar and different elements of their theory. Martha Rogers Description of the theory. Martha E. Rogers, one of the leading analysts of the field of nursing, was a strong advocate of nursing as a basic science (Parker, 2001b). Rogers is known for the paradigm she introduced to nursing called “The Science of Unitary Human Beings (SUHB)” (Parker, 2001b). The SUHB provided a revolutionary vision of nursing reality (Rogers, 1970). According to Rogers (1970), his framework provided a structure for nursing practice, education and research that promises to move away from the previously predominant medical model approach...... middle of article. ..... 2005).Health. Speaking of health, Orem stated that health is “a state of physical, mental, and social well-being and not merely the absence of disease or infirmity” (p. 184, cited in Foster and Bennett, 2001) . When referring to health, Orem uses the terms health, health status and well-being (Fawcett, 2005) Nursing. Nursing, as the art by which the nursing practitioner provides specialized assistance to persons with disabilities of such character that greater than ordinary assistance is necessary to meet their daily needs for personal care and to participate intelligently in the medical care they receive from the doctor. (Orem, cited by McLaughlin-Renpenning, 2002). These are actions deliberately selected and performed by nurses to help individuals or groups lie about their care in order to maintain or change their condition or that of their environment (Hartweg, 1991).