This document provides an overview of several nursing theories and concepts. It begins by describing Nightingale's Environmental Theory, which defines nursing as utilizing the patient's environment to assist in recovery. It then discusses Watson's Theory of Human Caring, which focuses on how nurses express care to patients. The document also outlines the nursing metaparadigm, which serves as a conceptual framework using the core concepts of person, environment, health, and nursing. Finally, it provides examples of how different nurse theorists have incorporated these concepts into their own theories.