Biomedical Cybernetics

A model is an constituent part of a theory. It is a representation or a construction of a reality.[1]

In cybernetics, models are usually generic and formalized, and they are based on a mathematical or simulative foundation. Therewith, theories which emanate from a process of theorizing that is based on explicit formal modelling have a potential to be stroinger in terms of both robustness and reach than theories that are largely based on implicit mental models.[1]

Quality criteria[]

Criteria for assessing the quality of a model include[2] :

  1. Validity (its ability to reproduce the historical data of the system to be modelled, under both normal and extreme conditions)
  2. The acceptability of the assumptions that have been made when defining the model
  3. Parametric isomorphism (The plausibility of the numerical values adopted for the parameters of the model)


  1. 1.0 1.1 Schwaninger, Markus ; Grösser, Stefan N.: System Dynamics as Model-Based Theory Building. In: Systems Research and Behavioral Science 25 (2008), Nr. 4, S. 447-465.
  2. Juan Martín García (2011), Theory and Practical Exercises of System Dynamics, Barcelona, Spain: Juan Martín García, ISBN 8460998045, 8460998045,