Archives For Risk

What is risk, how dow we categorise it and deal with it.

Screwtape(Image source: end time info)

A short (and possibly evil) treatise on SILs from our guest blogger

May I introduce myself? The name’s Screwtape, some of you might have heard of me from that short and nasty book by C.S. Lewis. All lies of course, and I would know, about lies that is… baboom tish! Anyway the world has moved on and I’m sure that you’d be completely unsurprised to hear that I’ve branched out into software consulting now. I do find the software industry one that is oh so over-ripe for the plucking of immortal souls, ah but I digress. Your good host has asked me here today to render a few words on the question of risk based safety integrity levels and how to turn such pesky ideals, akin in many ways to those other notions of christian virtue, to your own ends. Continue Reading…

Sharks (Image source: Darren Pateman)

Practical risk management, or why I love living in Australia

We’re into the ninth day of closed beaches here with two large great whites spotted ‘patrolling our shores’, whatever that means. Of course in Australia closed doesn’t actually mean the beaches are padlocked, not yet anyway. We just put a sign up and people can make their own minds up as to whether they wish to run the risk of being bitten. In my books a sensible approach to the issue, one that balances societal responsibility with personal freedom. I mean it’s not like they’re as dangerous as bicycles Continue Reading…

I was cleaning out my (metaphorical) sock drawer and came across this rough guide to the workings of the Australian Defence standard on software safety DEF(AUST) 5679. The guide was written around 2006 for Issue 1 of the standard, although many of the issues it discussed persisted into Issue 2, which hit the streets in 2008.

DEF (AUST) 5679 is an interesting standard, one can see that the authors, Tony Cant amongst them, put a lot of thought into the methodology behind the standard, unfortunately it’s suffered from a failure to achieve large scale adoption and usage.

So here’s my thoughts at the time on how to actually use the standard to best advantage, I also threw in some concepts on how to deal with xOTS components within the DEF (AUST) 5679 framework.

Enjoy :)

4blackswans

Or how do we measure the unknown?

The problem is that as our understanding and control of known risks increases, the remaining risk in any system become increasingly dominated by  the ‘unknown‘. The higher the integrity of our systems the more uncertainty we have over the unknown and unknowable residual risk. What we need is a way to measure, express and reason about such deep uncertainty, and I don’t mean tools like Pascalian calculus or Bayesian prior belief structures, but a way to measure and judge ontological uncertainty.

Even if we can’t measure ontological uncertainty directly perhaps there are indirect measures? Perhaps there’s a way to infer something from the platonic shadow that such uncertainty casts on the wall, so to speak. Nassim Taleb would say no, the unknowability of such events is the central thesis of his Ludic Fallacy after all. But I still think it’s worthwhile exploring, because while he might be right, he may also be wrong.

*With apologies to Nassim Taleb.

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Well if news from the G20 is anything to go by we may be on the verge of a seismic shift in how the challenge of climate change is treated. Our Prime Ministers denial notwithstanding :)

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A report issued by the US Chemical Safety Board on Monday entitled “Regulatory Report: Chevron Richmond Refinery Pipe Rupture and Fire,” calls on California to make changes to the way it manages process safety.

The report is worth a read as it looks at various regulatory regimes in a fairly balanced fashion. A strong independent competent regulator is seen as a key factor for success by the reports authors, regardless of the regulatory mechanisms. I don’t however think the evidence is as strong as the report makes out that safety case/goal based safety regimes perform ‘all that better’ than other regulatory regimes. Would have also been nice if they’d compared and contrasted against other industries, like aviation.

Well it was either Crowley or Kylie Minogue given the title of the post, so think yourselves lucky (Image source: Warner Brothers TV)

Sometimes it’s just a choice between bad and worse

If we accept that different types of uncertainty create different types of risk then it follows that we may in fact be able to trade one type of risk for another, and in certain circumstances this may be a preferable option.

Continue Reading…