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RE Engineering – Aspects which even not considerd in RE theory!

Veröffentlicht am Schreibe einen KommentarVeröffentlicht in Englische Blogs, Requirements Engineering eng

In most of the requirement engineering publications, the focus is on management aspects. The collection and management of requirements is discussed extensively. In the following blog I discuss important aspects which are not sufficiently considered in the RE theory. I start with the definition of Requirement Engineering in the book „Requirements Engineering Fundamentals“ (Klaus Pohl, […]

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Compiler for safety critical software – What needs to be done?

Veröffentlicht am Schreibe einen KommentarVeröffentlicht in DO178 eng, Englische Blogs, Functional Safety

The compiler is the central „tool“, which is required for every software development. It forms the link between the human-readable high-level source code (e.g., C and C ++) and the machine code, interpretable for the hardware processor. For the development of safety critical software according to relevant functional safety standards such as ISO26262 (car), EN50128 […]

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Freedom of Interference – The practice in Industry!

Veröffentlicht am Schreibe einen KommentarVeröffentlicht in DO178 eng, Englische Blogs, Functional Safety

In the last blog (June 2017), I explained the principle of Freedom of Interference. The example used was based on the automotive industry and the ISO26262. Now I would like to consider Freedom of Interference with respect to the industry sectors railway, aviation and automotive and share my industry experiences with you.

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ISO26262: Freedom of interference – What is that?

Veröffentlicht am 1 KommentarVeröffentlicht in Englische Blogs, ISO26262 eng

There are four essential measures in the development of safety-critical systems. Design of safe systems Measures to minimize random hardware errors Measures to minimize systematic hardware and software errors Organizational measures (management of functional safety) Particularly in the design of safe systems, the principle of Freedom of interference is a powerful measure. What’s this? The […]

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Challenges when determining the structural source code coverage on the target!

Veröffentlicht am Schreibe einen KommentarVeröffentlicht in DO178 eng, Englische Blogs, Functional Safety

The proof of a 100% structural source code coverage is required by almost all functional safety standards (IEC61508, ISO26262, DO 178C, etc.). In the individual SIL / ASIL levels, only the type of source code coverage is differentiated. Essentially, the Statement Coverage (low SIL / ASIL Level), the Branch Coverage and the MC / DC […]

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Good safety development process – What is it?

Veröffentlicht am Schreibe einen KommentarVeröffentlicht in DO178 eng, Englische Blogs, Functional Safety

IEC 61508, ISO26262, DO 178C, ISO 25119: Have you ever encountered these abbreviations in your professional life? If so, there is a high probability that you are already implementing functional safety projects in your company or that you are entering the market in the near future. Perhaps you have already made the experience, or at […]

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Implicit Testing – A good idea (Part 1)?

Veröffentlicht am Schreibe einen KommentarVeröffentlicht in Englische Blogs, Validation and Verification

In larger safety-critical projects, quite often I hear the following statement: „Well, the Requirement A is indirectly or implicitly proven with the test XY!“ Do you know this sentence as well? Have you ever experienced what can happen in late project phases when you have tested many requirements indirectly? The blog defines the term in […]

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User Stories – The better Requirements?

Veröffentlicht am Schreibe einen KommentarVeröffentlicht in Englische Blogs, Requirements Engineering eng

The book „User Stories“ from Mike Cohn (ISBN 978-0321205681) has inspired me to think about the relationship between user stories and requirements. In software development, agile methods are often preferred in recent years. The classic approaches, especially the waterfall model and the V-model, seem to be more and more outdated. As a result, user stories […]

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IEC61508: Specification – Architecture – Requirements; Is there any difference?

Veröffentlicht am 1 KommentarVeröffentlicht in Englische Blogs, IEC61508 eng

For an increasing number of systems in the industrial automation functional safety requirements must be fulfilled. The IEC61508 compliance must be demonstrated for the software development. On the other hand, there are commercial requirements which often severely limit the product development budget. The solution lies in an efficient development process that meets the safety-relevant requirements. […]