Validation and Verification Techniques
“The validity (or significance) of a model should be judged by its suitability for a particular purpose. A model is sound and dependable if it accomplishes what is expected of it. This means that validity, as an abstract concept divorced from purpose, has no useful meaning. What may be an excellent model for one purpose may be misleading and worse than useless for another purpose.”
—J.W. Forrester, “Industrial Dynamics”, MIT Press,
Cambridge, Mass., 1961