In order to identify the causes of problems and to initiate targeted measures to remedy the problems, causality relationships are examined, which are represented in cause-and-effect diagrams according to Kaoru Ishikawa. These representations may be a good aid for non-complex problems; however, cause-and-effect diagrams are not suitable for complex problems because the influencing variables can only be recorded in isolation and neither interactions nor time delays can be included. If cause-and-effect diagrams were used to solve complex problems, there would be a danger of arriving at incorrect results that would not be able to unfold their effect. For complex problems, cause-and-effect diagrams can be modeled and then simulated using applications of the System Dynamics (SD) method, for example Consideo Modeler, Vensim or AnyLogic.