What is a system?
A system can be defined as “a set of elements which are connected by certain relationships…”  (Duden 2007). “A system is made up of elements which are in certain relationship with each other”  (Ossimitz 2000, p. 3). The relationships between the elements of a system facilitate specific processes or operations. Furthermore, a system has to be distinguishable from its environment, i.e. it is necessary to define system borders. Other properties of a system are purpose, i.e. the function of the system, and temporal behavior (Ossimitz 2000, p. 3).
 Own translation, original in German: “eine Menge von Elementen, zwischen denen bestimmte Beziehungen bestehen....“
 Own translation, original in German: “Ein System besteht aus Elementen, die in bestimmten Relationen zueinander stehen“
Duden (2007) Band 5 , Fremdwörterbuch, Mannheim.
Ossimitz, G. (2000) Einführung in die Systemwissenschaften, Karl-Franzens Universität Graz. Graz.
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