Support for argument structures review and assessment |
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Authors: | Lukasz Cyra,Janusz Gó rski |
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Affiliation: | a Adelard LLP, College Building, 10 Northampton Square, London EC1V 0HB, UK b Gdansk University of Technology, Department of Software Engineering, Narutowicza 11/12, 80-952 Gdansk, Poland |
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Abstract: | Argument structures are commonly used to develop and present cases for safety, security and for other properties of systems. Such structures tend to grow excessively, which causes problems with their review and assessment. Two issues are of particular interest: (1) systematic and explicit assessment of the compelling power of an argument, and (2) communication of the result of such an assessment to relevant recipients. The paper presents a solution to these problems. The method of Visual Assessment of Arguments (VAA), being this solution, is based on the Dempster-Shafer theory of evidence applied to the assessment of the strength of arguments, and a visual mechanism of issuing and presenting assessments, supported by the so-called opinion triangle. In the paper we explain theoretical grounding for the method and provide guidance on its application. The results of some validation experiments are also presented. |
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Keywords: | Argument structures Argument assessment Dempster-Shafer model VAA Trust case |
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