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New Refinement Relations of Z Specifications for multiple viewpoints oriented requirements method

Wuhan University Journal of Natural Sciences 2001年第Z1期6卷 304-312页

作者： He Yan xiang, Song Qiang, Huang Qian School of Computer, State Key Laboratory of Software Engineering Wuhan University, Wuhan 430072, China School of Computer State Key Laboratory of Software Engineering Wuhan University Wuhan China

In this paper we develop several new refinement relations of Z for multiple viewpoints oriented requirements method (MVORM). The original motivation is that we found the standard Z refinement relation is not adequate or correct when considering specifications that have temporal relationships of operations. The concept of temporal state variables is introduced into Z. Then new implementation relations are defined and new refinement relations are deduced, mainly for temporal state variables to process temporal relationships of operations. We use state transition systems to abstract the temporal state transitions. A simple example is used to show the procedures of MVORM. Finally some directions of further work are forwarded.

关键词： temporal state variable formal description language state transition system implementation relation refinement relation multiple viewpoints oriented requirements method

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Two Generic Frameworks of multiple viewpoints oriented requirements method and Their Comparison

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Wuhan University Journal of Natural Sciences 2001年第Z1期6卷 313-319页

作者： Song Qiang, He Yan xiang, Huang Qian School of Computer Science, State Key Laboratory of Software Engineering, Wuhan University, Wuhan 430072, China School of Computer Science State Key Laboratory of Software Engineering Wuhan University Wuhan China

Traditional requirements method has some problems when it is used for large distributed systems. multiple viewpoints oriented requirements method (MVORM) is a new method for resolving these problems. This paper develops two generic formal frameworks of MVORM, framework based on refinement relation (FBRR) and framework based on implementation relation (FBIR). They are generic, because no assumptions are made about the development process or the formal description languages to be used. Three kinds of specification relations and three kinds of specification transformations are discussed over FBIR and FBRR. This paper also compares the equivalence between FBIR and FBRR. We point out that an equivalent FBIR can be found for any FBRR, but reverse transformation is not always possible. We think FBIR is better than FBRR on most cases.

关键词： multiple viewpoints oriented requirements method framework based on refinement relation framework based on implementation relation refinement relation implementation relation

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