The NPA model has the delightful properties of being scientifically based, predictive and falsifiable, but it is unknown to the Behavioral Sciences community and has not been tested.
If one proposed an additional three traits in addition to the NPA traits, one would have to specify what they were in behavioral terms and what additional personality types they generated. In developing our model we tried to satisfy Occam's Razor and kept the model's parameters as simple as possible.
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