after a person has been calibrated, I have never heard them offer such challenges. Apparently, the hands-on experience of being forced to assign probabilities, and then seeing that this was a measurable skill in which they could see real improvements, addresses these concerns. Although this was not an objective I envisioned when I first started calibrating people, I came to learn how critical this process was in getting them to accept the entire concept of probabilistic analysis in decision making.
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