“A system where T is a set of things and R is a relation defined on T” [1]. The things are interdependent or interrelated and form a unified whole. The Guide to the Systems Engineering Body of Knowledge (SEBoK) vI.3 states that “in the broad community, the term system can mean an engineered system, a natural system, a social system, or all three” [2]. Examples of natural systems include river systems, the solar system, and the digestive system. Designed systems contain elements with a common purpose, and include organized sets of ideas or principles, for example the metric system; procedural systems such as a business process; and human activity systems, including social, economic and political systems. Systems thinking means understanding connections and interdependencies in such systems.