There is a close relationship between systems thinking and W. Edwards Deming's theory of profound knowledge. Deming believed that organizations are complex systems made up of interrelated parts, and that management must understand this systems perspective to optimize performance. His theory of profound knowledge presents four essential components for understanding organizations as systems: an appreciation of systems, an understanding of psychology and driving change, a theory of knowledge and learning, and knowledge about variation. Together these provide a framework for continuous improvement through engaging employees and taking a long term, systems-oriented approach to management and leadership.