The authors propose a new incremental protocol verification method for the extended communicating finite state machine (ECFSM) model. The new method is based on the concept of dead and live variables proposed in P. M. Chu and M. T. Liu's ECFSM reduction technique (1989). By analyzing the dead and live variables, global states which have the same values for live variables and different values for dead variables can be treated as equivalent. Dead variable and live variable sets may be changed when the protocol is modified. Therefore, the equivalent property of global states may be changed accordingly. As a result, the change of dead and live variable sets needs to be considered in the incremental verification process. Based on the new method, the incremental verification process can be directly applied in ESTELLE or SDL verification tools.
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