Synthesisofbehavioralmodelsfromscenarios - IEEE...

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Synthesis of Behavioral Models from Scenarios Sebastian Uchitel, Member , IEEE Computer Society , Jeff Kramer, , IEEE Computer Society , and Jeff Magee, , IEEE Abstract —Scenario-based specifications such as Message Sequence Charts (MSCs) are useful as part of a requirements specification. A scenario is a partial story, describing how system components, the environment, and users work concurrently and interact in order to provide system level functionality. Scenarios need to be combined to provide a more complete description of system behavior. Consequently, scenario synthesis is central to the effective use of scenario descriptions. How should a set of scenarios be interpreted? How do they relate to one another? What is the underlying semantics? What assumptions are made when synthesizing behavior models from multiple scenarios? In this paper, we present an approach to scenario synthesis based on a clear sound semantics, which can support and integrate many of the existing approaches to scenario synthesis. The contributions of the paper are threefold. We first define an MSC language with sound abstract semantics in terms of labeled transition systems and parallel composition. The language integrates existing approaches based on scenario composition by using high-level MSCs (hMSCs) and those based on state identification by introducing explicit component state labeling. This combination allows stakeholders to break up scenario specifications into manageable parts and reuse scenarios using hMCSs; it also allows them to introduce additional domain- specific information and general assumptions explicitly into the scenario specification using state labels. Second, we provide a sound synthesis algorithm which translates scenarios into a behavioral specification in the form of Finite Sequential Processes. This specification can be analyzed with the Labeled Transition System Analyzer using model checking and animation. Finally, we demonstrate how many of the assumptions embedded in existing synthesis approaches can be made explicit and modeled in our approach. Thus, we provide the basis for a common approach to scenario-based specification, synthesis, and analysis. Index Terms —Requirements specification, scenario-based specification, Message Sequence Charts, sequence chart combination, requirements analysis. æ 1I NTRODUCTION T HE software engineering community has long under- stood the importance of requirements elicitation. Stake- holder involvement in the elicitation process and tools to help build a common ground between stakeholders and developers are essential to obtain a good requirements definition. Consequently, it is not surprising that scenarios have become increasingly popular as part of a requirements specification. Scenarios describe how system components (in the broadest sense) and users interact in order to provide system level functionality. Each scenario is a partial story which, when combined with other scenarios provides a more complete system description. Thus, stakeholders may
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This note was uploaded on 09/06/2009 for the course CIS 12414 taught by Professor Deloach,scotta during the Fall '09 term at Kansas State University.

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Synthesisofbehavioralmodelsfromscenarios - IEEE...

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