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1、TOWARDSINTEGRATEDSAFETYANALYSISANDDESIGNPFenelon,JAMcDermid,MNicholson,DJPumfreyHighIntegritySystemsEngineeringGroup,DepartmentofComputerScience,UniversityofYorkAbstractTherearecurrentlymanyproblemswiththedevelopmentandassessmentofsoftwareintensivesafety-criticalsystems.Inthispaperwedescribet
2、heproblems,andintroduceanovelapproachtotheirsolution,basedaroundgoal-structuringconcepts,whichwebelievewillamelioratesomeofthedifficulties.Wediscusstheuseofmodifiedandnewformsofsafetyassessmentnotationstoprovideevidenceofsafety,andtheuseofdataderivedfromsuchnotationsasameansofprovidingquantif
3、iedinputintothedesignassessmentprocess.Wethenshowhowthedesignassessmentcanbepartiallyautomated,andfromthisdevelopsomeideasonhowwemightmovefromanalyticaltosyntheticapproaches,usingsafetycriteriaandevidenceasafitnessfunctionforcomparingalternativeautomatically-generateddesigns.Keywordssafetyass
4、essment,architecturaldesign,goalstructures,methodintegration,automateddesignIntroductionindicatehowtocarryoutautomatedanalysisofatleastsomesafetyproperties,buildingonclassicalapproachessuchasMarkovchains.Muchcurrentindustrialpracticeinthedesignandassessmentofsafety-criticalsystemscould,onlysl
5、ightlyunfairly,beThird,weconsiderhowtousetheanalysistechniquestoguidecharacterisedasan‘overthewall’process.Adesignisdesignsynthesis,i.e.derivingdetaileddesignsfrommoreproducedwithsomecognisanceofsafetyissues,itis‘tossedabstractdesignssothattheyhavethedesiredsafetyandtimingoverthewall’tosafety
6、assessorswhoanalysethedesignandproperties.Ourapproachusesheuristicsforsearchingthelater‘tossitback’togetherwithcommentsonthesafetyofthedesignspace,andtheautomatedanalysistechniquesfordesignandrequestsforchange.Whilstsomethingofa‘pruning’thespace,i.e.rejectingunsuitabledesigns.Whilstcaricature
7、,theaboveisnotentirelyunrepresentativeofcurrentthisworkisinitsearlystages,itdrawstogethertheothertwoindustrialprocesses.strands,andindicatesthewayinwhichwebelieveitwillbepossibletoachieveamuchmorestronglyintegrated,andIndustrialprocesseswhich
