Finding the causes of unrealizability of reactive system formal specifications

Reactive systems are the systems that maintain some interaction with their environment. Temporal logic is one of the methods for formal specification descriptions of reactive systems. The formal specifications of reactive systems enables to check the consistency of the specifications and whether they contain defects. By using a synthesis algorithm we also obtain reactive system programs from the formal specifications and prevent programming bugs. Thus, it is important to describe reactive system formal specifications. However, it is difficult to describe realizable reactive system specifications and it is necessary to find the causes of unrealizable reactive system specifications. In previous research, three properties have been introduced into unrealizable reactive system specifications and we suppose that this classification gives the hists of finding the causes of unrealizability. In this paper we propose several heuristics of finding the causes of unrealizability of reactive system formal specifications. To find the causes, we use tableau methods and the classification of the reactive system specifications.