and other quantitative fields have defined uncertainty, risk, and their measurement as:

Uncertainty

The lack of certainty, a state of limited knowledge where it is impossible to exactly describe one or more of the following: the existing state or goal or set of options, the full set of possible future states or their probabilities or their values or utilities to stakeholders, the full set of stakeholders involved, or any other piece of information that inhibits the calculation of the full

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