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Probability Impact Graphs do not fly

Probability Impact Graphs do not fly. For short PIGs do not fly was part of the title of a risk management course we gave at TMW 2012. In that course we explained why Probability Impact Graphs (PIGs) and “heat maps” are obsolete, misleading and should be abandoned. We recently read a paper by D. Vose who is finally “kinda coming to our side”. We are delighted by his paper. Indeed, at Riskope we started over ten years ago to point out…

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Car accidents, cold, more examples of biased and misleading FMEA/PIGs results

Reviewing Car accidents, cold, more examples of biased and misleading FMEA/PIGs results adds to prior information published in this blogpost. In particular we show how results of a Risk assessment matrix 5×5 or 4×4 can actually cloud our judgement. Car accidents, cold, more examples of biased and misleading FMEA/PIGs results Dear X, Thank you for asking us to review your draft Risk Assessment for the ACME Inc. operation. I reviewed your FMEA/PIG risk matrix 4×4 and have the following remarks. Note if…

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