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Numerous formal specification methods for reactive systems have been proposed in the literature. Because the significant differences between the methods are hard to determine, choosing the best method for a particular application can be difficult. We have applied several different methods, including Modechart, VFSM, ESTEREL, Basic LOTOS, Z, SDL and C, to an application problem encountered in the design of software for AT&T's 5ESS R telephone switching system. We have developed a set of criteriadoi:10.1109/32.508312 fatcat:ddzfqvhyi5dydaw5wcncxlhwta