Category Archives: ISO 26262

Similarity between Academic paper and Requirements

When researcher writes academic paper, one of important thing is to make structure. Usually research is one’s own study so it is hard to understand for people who are not interested in the topic. So s/he has to consider how to reader can understand easily.

S/he also consider internal consistency for better understanding.

I realized that writing requirement is quite similar to write an academic paper. If requirements are written without consideration of structure, it is hard to understand. Readers cannot understand what are system’s sub systems, what are functions allocated to sub-systems.

It is not technical point of view. But if they are not clear it is hard to defense against audit, because auditor will confuse it and will not understand what you are saying.

Then s/he will not give a good grade.




Certification Liaison Process

This process is specified in DO-178C. It is a kind of communication process with Certification Authority. It is very important for suppliers to get a good results. I’ve never  experienced about type certification or airworthiness certification, but I think that I can imagine the procedure because there are published document.

Though it is natural to think, applicant has to submit safety plan to certification body and it can be proceed if the plan is approved by certification authority.

It would be ridiculous if applicant submit safety plan in the middle of the project. What if the plan is rejected? Everything they have done so far must be dumped.

Unfortunately this process is not defined in the automotive, but it also essential for supplier. Competent OEM may have a detailed process for audit and assessment.

You can also refer a book, “Developing Safety-Critical Software(DO-178C)” in chapter 12

Developing Safety-Critical Software(DO-178C)에 대한 이미지 검색결과


J2980 – Considerations for ISO 26262 ASIL Hazard Classification

It is a recommended practice published in SAE. It is short(53 pages), and easy to understand. It explains step by step approach with example.

So I believe that it would be a good material to understand concept development.

I excerpt titles of key sections.

  • Identification of Hazards
  • Risk Assessment
    • Step 1. Exposure determination
    • Step 2. Severity determination
    • Step 3. Controllability determination
    • Step 4. ASIL determination
  • Appendix – Example

if you have kind OEM that shares their work products, then you don’t have to read the paper, but if you are a student or a person that cannot access them, it would be useful.