Orem explained, “My colleagues and I recognized and sought to understand the complexity of nursing. As our work progressed, we discovered that a definitive definition and a general theory of nursing were the useful intellectual tools to recognize and address the realities of nursing and its complexity in the world of nurses and their patients." (2011, p. 37). In doing so they created a complex theory that is divided into three parts: self-care, self-care deficit, nursing systems. Self-care is the individual's ability to take care of himself, which includes maintaining life, health, development and well-being. When an individual is unable to meet these needs, a deficit occurs. Once the deficit exceeds the ability to care for oneself, nursing systems are needed. This deficit and the desire to restore health and return to health care are the essence of nursing