Fuzzy situational approach implementation using fuzzy hierarchical situation-eventual net

The questions of making decision support while planning and operative control of complicated organization-technical systems are considered in this article. Using fuzzy situational net apparatus for solving the referred task class is motivated. Authors offer a fuzzy situational net classification, depending of net’s constructing and acting features. New fuzzy situational net model – Fuzzy Hierarchical Situation-Eventual Net is developed, allowing to get over known limitations of fuzzy situational net apparatus during solving the referred task class. A number of questions of offered net kind constructing and usage are considered. A knowledge base structure, using offered net kind, is offered.