A nursing theory is a set of concepts, definitions, relationships, and assumptions or propositions derived from nursing models or from other disciplines and project a purposive, systematic view of phenomena by designing specific inter-relationships among concepts for the purposes of describing, explaining, predicting, and /or prescribing. A theory is a group of related concepts that propose action that guide practice. Theory refers to “a coherent group of general propositions used as principles of explanation” The importance of nursing theories in education is to reinforce the nursing practices of patient treatment and care. Students who understand why a certain procedure is performed or what to expect from particular patients and situations have a basis for learning the actual practices that make up patient care and treatment. Nursing theory also defines the role of a nurse in the medical field, hospital or medical practice. It creates what is known as a body of knowledge for both the nurse in training and the veteran.

Key Words: Nursing theories; Nursing process; Pneumonia.