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** (.):** criteria importance theory, value function, reducing costs

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** (.):** According to the results of a computational experiment using decision rules of criteria importance theory can reduce 25 times the time spent on constructing a value function compared with a traditional approach of utility theory. For the case of two-variant and two-criterion choice the theorem is proved to quantify how many times criteria importance theory allows to reduce the proportion of cases when the value must be constructed.

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