Analyzing refinements of state based specifications: the case of TB nets
ISSTA '93 Proceedings of the 1993 ACM SIGSOFT international symposium on Software testing and analysis
Proving Properties of Real-Time Systems Through Logical Specifications and Petri Net Models
IEEE Transactions on Software Engineering
Merlot: a tool for analysis of real-time specifications
IWSSD '93 Proceedings of the 7th international workshop on Software specification and design
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It has been repeatedly observed that the standard safety-liveness classification of properties of reactive systems does not fit for real-time properties. This is because the implicit "liveness" of time shifts the spectrum towards the safety side. While, for example, response--that "something good" will happen, eventually--is a classical liveness property, bounded response--that "something good" will happen soon, within a certain amount of time--has many characteristics of safety. We account for this phenomenon formally by defining safety and liveness relative to a given condition, such as the progress of time.