This document provides an overview of Betty Neuman's Neuman Systems Model nursing theory. It outlines Neuman's credentials and background, the theoretical sources that influenced the development of the model. Key concepts of the model like the client system, lines of defense, stressors, and prevention as intervention are defined. The empirical evidence and acceptance of the model in nursing practice, education, and research are examined. Finally, a case simulation demonstrates the application of the Neuman Systems Model.