The wilful imposition of a
constraint on a set of initially possible alternatives. In the extreme case, the choice of one from a set of initially conceivable but after the decision and by virtue of that decision no longer available courses of action, messages, objects, properties, etc. The power of a decision is measured by the dual
logarithm of the logical
probability of the remaining to the initial set of possibilities (
see information, law of requisite variety ,
bit ). (
Krippendorff )
