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Deriving Hierarchical Safety Contracts
Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems. (Software Engineering)ORCID iD: 0000-0002-9347-1949
Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems. University of York, UK.ORCID iD: 0000-0003-2415-8219
2016 (English)In: Proceedings: 2015 IEEE 21st Pacific Rim International Symposium on Dependable Computing, PRDC 2015, 2016, Vol. jan, 119-128 p.Conference paper, Published paper (Refereed)
Abstract [en]

Safety cases need significant amount of time and effort to produce. The required amount of time and effort can be dramatically increased due to system changes as safety cases should be maintained before they can be submitted for certification or re-certification. Anticipating potential changes is useful since it reveals traceable consequences that will eventually reduce the maintenance efforts. However, considering a complete list of anticipated changes is difficult. What can be easier though is to determine the flexibility of system components to changes. Using sensitivity analysis is useful to measure the flexibility of the different system properties to changes. Furthermore, contracts have been proposed as a means for facilitating the change management process due to their ability to record the dependencies among system’s components. In this paper, we extend a technique that uses a sensitivity analysis to derive safety contracts from Fault Tree Analyses (FTA) and uses these contracts to trace changes in the safety argument. The extension aims to enabling the derivation of hierarchical and correlated safety contracts.We motivate the extension through an illustrative example within which we identify limitations of the technique and discuss potential solutions to these limitations. 

Place, publisher, year, edition, pages
2016. Vol. jan, 119-128 p.
National Category
Electrical Engineering, Electronic Engineering, Information Engineering Computer Systems
Identifiers
URN: urn:nbn:se:mdh:diva-29131DOI: 10.1109/PRDC.2015.21ISI: 000380403300013Scopus ID: 2-s2.0-84964371811ISBN: 978-146739376-8 (print)OAI: oai:DiVA.org:mdh-29131DiVA: diva2:856718
Conference
21st IEEE Pacific Rim International Symposium on Dependable Computing, PRDC 2015; Zhangjiajie; China; 18 November 2015 through 20 November 2015; Category numberE5673; Code 118981
Available from: 2015-09-25 Created: 2015-09-25 Last updated: 2016-08-18Bibliographically approved
In thesis
1. Enhancing the Maintainability of Safety Cases Using Safety Contracts
Open this publication in new window or tab >>Enhancing the Maintainability of Safety Cases Using Safety Contracts
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Safety critical systems are those systems whose failure could result in loss of life, significant property damage, or damage to the environment. These systems require high quality and dependability levels in them, where system safety is a major property that should be adequately assured to avoid any severe outcomes. Many safety critical systems in different domains (e.g., avionics, railway, automotive, etc.) are subject to a certification. The certification process is based on an evaluation of whether the associated hazards to a system are mitigated to an acceptable level. Safety cases are often required to demonstrate how a regulatory body can reasonably conclude that a system is acceptably safe from the evidence available. The development of safety cases has become common practice in many safety critical system domains. However, safety cases are costly since they need significant amount of time and efforts to produce. This cost can be dramatically increased (even for already certified systems) due to system changes as they require maintaining the safety case before it can be submitted for certification. Anticipating potential changes is useful since it reveals traceable consequences that will eventually reduce the maintenance efforts. However, considering a complete list of anticipated changes is difficult. What can be easier though is to determine the flexibility of system components to changes.

Sensitivity analysis has been proposed as a useful tool to measure the flexibility of the different system properties to changes. Furthermore, the concept of contracts have been proposed as a means for facilitating the change management process due to their ability to record the dependencies among system's components. In this thesis, we use sensitivity analysis to support changes prediction and prioritisation. We also use safety contracts to record the information of changes that will ultimately advise the engineers what to consider and check when changes actually happen.

Place, publisher, year, edition, pages
Västerås: Mälardalen University, 2015
Series
Mälardalen University Press Licentiate Theses, ISSN 1651-9256 ; 220
National Category
Software Engineering
Research subject
Computer Science
Identifiers
urn:nbn:se:mdh:diva-29133 (URN)978-91-7485-238-7 (ISBN)
Presentation
2015-11-13, Mälardalens högskola, Delta, Västerås, 13:15 (English)
Opponent
Supervisors
Available from: 2015-10-07 Created: 2015-09-25 Last updated: 2015-11-09Bibliographically approved

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Jaradat, OmarBate, Iain

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