There are many definitions of Complexity, therefore many natural, artificial and abstract objects or networks can be considered to be complex systems, and their study (complexity science) is highly interdisciplinary. Examples of complex systems include ant-hills, ants themselves, economies, nervous systems, cells and living things, including human beings, as well as modern energy or telecommunication...

Systems Theory (or Theorie) or General Systems Theory or Systemics is an interdisciplinary field which studies Systems as a whole. Systems Theory was founded by Ludwig von Bertalanffy, William Ross Ashby and others between the 1940s and the 1970s with focus on Physics, Biology, and Engineering, and it later grew with connections into Philosophy, Sociology, and Economics, as developed by Fritjof Capra and others, as...