Description: In the article question of receipt weight coefficients uncertainty at their expert evaluation is considered. Weight coefficients are used for combining of complex object’s separate properties. The uncertainty is calculated taking into account possible operations for an ordinal scale which the values of weight coefficients are represented after. For practical application tables, after which it is possible to get confiding probability after the numbers of index statistician and by the amount of experts which are involved at an evaluation are developed.
Keywords: ordinal scale, weight coefficients, expert evaluation, uncertainty