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Using Safety Contracts to Guide the Integration of Reusable Safety Elements within ISO 26262



Under submission

Publication Type:

Report - MRTC


MRTC Report, Mälardalen Real-Time Research Centre


Mälardalen Real-Time Research Centre, Mälardalen University




Safety-critical systems usually need to be compliant with a domain-specific safety standard, which in turn requires an explained and well-founded body of evidence to show that the system is acceptably safe. To reduce the cost and time needed to achieve the standard compliance, reuse of safety elements is not sufficient without the reuse of the accompanying evidence. The difficulties with reuse of safety elements within safety-critical systems lie mainly in the nature of safety being a system property and the lack of support for systematic reuse of safety elements and their accompanying artefacts. While safety standards provide requirements and recommendations on what should be subject to reuse, guidelines on how to perform reuse are typically lacking.We have developed a concept of strong and weak safety contracts that can be used to facilitate systematic reuse of safety elements and their accompanying artefacts. In this report we define a safety contracts development process and provide guidelines to bridge the gap between reuse and integration of reusable safety elements in the ISO 26262 safety standard. We use a real-world case for demonstration of the process, in which a safety element is developed out-of-context and reused together with its accompanying safety artefacts within two products of a construction equipment product-line.


author = {Irfan Sljivo and Barbara Gallina and Jan Carlson and Hans Hansson},
title = {Using Safety Contracts to Guide the Integration of Reusable Safety Elements within ISO 26262},
note = {Under submission},
month = {March},
year = {2015},
publisher = {M{\"a}lardalen Real-Time Research Centre, M{\"a}lardalen University},
url = {}