Taxonomies and completeness redux

11/09/2016 — Leave a comment

About time I hear you say! 🙂

Yes I’ve just rewritten a post on functional failure taxonomies to include how to use them to gauge the completeness of your analysis. This came out of a question I was asked in a workshop that went something like, ‘Ok mr big-shot consultant tell us, exactly how do we validate that our analysis is complete?’. That’s actually a fair question, standards like EUROCONTROL’s SAM Handbook and ARP 4761 tell you you ought to, but are not that helpful in the how to do it department. Hence this post.

Using a taxonomy to determine the coverage of the analysis is one approach to determining completeness. The other is to perform at least two analyses using different techniques and then compare the overlap of hazards using a capture/recapture technique. If there’s a high degree of overlap you can be confident there’s only a small hidden population of hazards as yet unidentified. If there’s a very low overlap, you may have a problem.

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