Object Composition and Re nement by using Non - Observable Projection Operators : A Case Study of the Automated Teller Machine system
نویسندگان
چکیده
The foundations of the eld of behavioral speci cation have matured. So, case studies are the important current topics of this eld. In our previous work, we built the behavioral speci cation of the Automated Teller Machine (ATM) system by using object composition and observable projection operators. From this experience, we noticed that this approach had the following problems: there was no good method for designing the hierarchical structure of the system, veri cation times of behavioral properties were too long, and there was no good method for specifying the partiality of actions. To solve these problems, we propose an approach using object composition, stepwise re nement, and nonobservable projection operators. By using this approach, we specify the ATM system.
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