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The example model revisited

In the example we chose to classify vehicles into road vehicles and rail vehicles. But this is only one of many different ways of classifying vehicles. For example we might have been interested in what fuel they use, whether they have wheels, or whether they are used for transporting people or freight.

The choice of what criteria to use for the asserted taxonomy is entirely arbitrary, but it should be consistent. Mixing different principles in the asserted hierarchy means that it is impossible to determine why something is classified in a given place.

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