SUMMARY
The existing approach to the optimization of the technological processes does not adequately account for differences in quality of products, manufactured by different embodiments of technological process, if output control is not guaranteed to detect all defects. Also not taken into account correction of products quality, which is based on results of control operations. The purpose of research is improving quality of technological processes optimization based on accounting for correction of quality during control operations and probabilistic costs for eliminating defects on the following stages of manufacturing. To achieve this purpose we proposed a model of different variants of technological process as a course directed graph. This model allows finding optimal technological process with taking into account dynamics of defects distributions during of technological processand adjusted costs. For illustration of proposed model we calculated the fragment of converter’s board manufacturing process.