Problem: To further understand the question, one must understand what a theory is. According to the Merriam-Webster Dictionary, Theory is a belief, policy, or procedure proposed or followed as the basis of action. Having a better understanding of what defines a nursing theory, we understand that a nursing theory is an organized concept that guides the nursing profession on how to carry out care in a certain way, which has been proven to be an effective way to practice. One main theorist that nurse's are familiar with is the founder of nursing, Florence Nightingale. Her theories emphasized how the environment can affect the patient's health and the steps that can be taken to prevent negative outcomes. There are various theorists with many theories from infection control to the mental and emotional aspects of a patient. Once a nurse has an understanding of these theories, they then can know how to implement them into daily nursing care and create beneficial changes in the patient. Need Assignment Help?