A comparative evaluation of the Z, CSP, RSL, and VDM languages

A comparative evaluation of the Z, CSP, RSL, and VDM languages

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A Comparative Evaluation of the Z, CSP, RSL, and VDM Languages Mohammad Reza Nami, Fatemeh Hassani Islamic Azad University- Qazvin Branch, Qazvin, Iran {nami1352, fatimahassani.31th}@gmail.com Abstract The software engineering process has been described in many ways. Today, few of these deal specifically with the use of formal methods in software engineering. New software engineering uses formal specification languages in system analysis, requirement analysis, and system design to develop software for critical-safety systems. Formal specification languages describe the system at a much higher level than a programming language. They are catego- rized into model-oriented, constructive, algebraic, process model, hybrid, and logical. This paper describes the properties and types of formal specification languages in software engineering. It then compares the Z, VDM, RSL, and CSP formal specification lan- guages from different point of views. Keywords : Software Engineering, Formal Specification Languag- es, Verification, the Z Language, VDM, RAISE, Method, CSP Language. 1. Introduction Formal methods provide the basis for the precise definition of consistency, completeness, specification, implementation, and cor- rectness [1]. Formal method is the applied mathematics of comput- er systems engineering. These methods are used to develop reliable software for critical systems such as Air Traffic Control (ATC) [2]. New software engineering [3] serves them for the development of safety critical systems in three phases including domain engineer- ing, requirement engineering, and design and implementation. Some Researchers use formal (mathematical) techniques in the development of software including requirements analysis and for- mulation, specification, design and development. Formal software engineers also build models of systems, but mathematical abstractions rather than scale models. A specification language [4] serves formal method idea which is based on mathematics. Therefore, specifying a system with a formal language is approvable. Unlike most programming languages, which are directly executable formal languages used to implement a system, specification languages are used during systems analysis, requirements analysis and systems design. A formal specification language describes a system in a formal model. Formal models are largely concerned with functionality, whereas engineering models generally are largely concerned with performance and reliability. Perhaps this is because engineering functions are often straightforward, whereas computing functions are rarely so [5]. Formal specification languages that combine functional and non-functional aspects have already appeared, but will need much more development. This paper is organized as follows. An overview of formal spe-
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A comparative evaluation of the Z, CSP, RSL, and VDM languages

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