Complexity thinking is slowly emerging in health systems, while the transdisciplinary fields of complexity science and theory are developing at a much faster pace. A dictionary of complexity comprising 11 volumes of state of the art theory and knowledge has been published as a reference book, yet only two papers relate to health in this epic publication [2]. Peter Erdi, in another but more accessible reference publication, illuminates how complex collective behaviour emerges from the parts of a system, because of the interaction between the system and its environment [3].
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