Agile development has already proven to be a big success in several areas of application. It started in areas like web development but has now even moved into safety critical domains – e.g. air traffic management, automotive. Companies working with industrial automation – e.g. ABB – are considering using an agile development process. The main reason for this is that requirements changes are mor...

According to IEC 61508, a safety-related system is regarded as type B if it presents a high complexity (i.e. the failure mode of at least one component is not well defined, or the behaviour under fault conditions cannot be completely determined), or if there is insufficient data to support claims for failure rates. This paper proposes a modelling method adapted to the evaluation of failure prob...

The purpose of this white paper is to describe the experience gained by Enea OSE System during certification of the OSE RTOS to the international standard IEC 61508 and the experience from on-going projects to show certifiability to the RTCA standard DO-178B. The goal is also to show that COTS can be used within safety systems, if the product has the artifacts required to be certifiable to thes...

Abstract The reliability and safety of any system is the most important qualitative characteristic of a system. This qualitative characteristic is of particular importance in systems whose functions are under various stresses, such as high temperature, high speed, high pressure, etc. A considerable point, which is rarely taken into account when calculating the reliability and safety of syst...

Mishap investigations provide important information about adverse events and are intended to help avoid any recurrence of previous failures. However, the complexity of many safety critical systems poses new challenges for mishap analysis. Similarly, the recognition that many failures have complex, systemic causes has helped to widen the scope of many mishap investigations. A new generation of m...

Die Normen DIN EN 61508 und DIN EN 62304 beschreiben Sicherheitsanforderungen für die Entwicklung von Software im medizinischen Umfeld. Diese beinhalten u.a. Vorschriften zur Verifikation und Diagnose (Kapitel C5, DIN EN 61508-7 [Di09]), zur Beurteilung der funktionalen Sicherheit (Kapitel C6, DIN EN 61508-7 [Di09]), zur Implementierung und Verifikation von Software-Einheiten (Kapitel 5.5, DIN ...