In this report we discuss the Significant Event Temporal Logic specification technique (SIGETL), a method for protocol specification and verification using a temporal logic axiomatic system. This technique is based on the idea that the state and the behaviour of a module can be completely described by the sequence of the significant events with which the module was involved in communicating with its environment till the present time. The behaviour of a module at any time is specified by simple temporal logic formulas, called transition axioms or properties of the module. Both, the safety and liveness properties of a module, as well as the global properties of a system, can be proven from its axioms using the axiomatic temporal logic system. As an example, we apply SIGETL to specify and verify a simple data transfer protocol. The general correspondence between SIGETL and ESTELLE FDT is also discussed.
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