AbstractThe method, allowing the individual forecasting of reliability for each item of the general totality with availability of corresponding information, has been developed and realised. For the method of item operability forecasting, applications and field conditions are discussed, together with the statement of individual forecasting problem and theoretical forecasting apparatus.The most effective algorithm of piecewise-linear approximation in synthesizing a separating function has been determined for individual reliability forecasting of highly reliable items.This paper considers the problem of choosing the initial set of parameters containing information on item reliability. It has been shown that utilization of a combined algorithm of a directed exhaustion is most expedient for individual forecasting of items reliability.The paper touches upon some results of the method’s practical use as well.The software product and methodology could be discussed on a commercial basis.