Modular safety cases provide a means of organising large and/or complex safety cases into separate but interrelated component modules of argument and evidence. Safety case 'contracts' can be used to record the interdependencies that exist between safety case modules - e.g. to show how the claims of one module support the arguments of another. A number of techniques for structuring and describing modular safety cases using the Goal Structuring Notation were defined by Kelly in (Kelly 2001). The Industrial Avionics Working Group, (IAWG) has been using these techniques as part of a substantial industrial case study being funded by the UK Ministry of Defence. Based on this experience, and a number of issues encountered, modifications to the original approach have been defined. This paper presents some of these experiences of the IAWG in using 'modular' GSN - in particular, those relating to capturing and recording safety case contracts - and proposes an enhanced approach.
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机译:CCTV PA / AV / CPTED盒CCTV PA / AV / CPTED盒3 CCTV与CPTED盒的组合SmartPole以及与Smartpole Cpted Box的Muli-Provider System合同,具有防犯CCTV PA / AV广播系统和方式 为工人防灾和工业安全和健康管理中央电视台监测系统播放市政公共关系和健康管理中央电视台监测系统 工人防灾