prads,

You didn't get back to us in your similar RAM thread last week.

Didn't really find a sample matrix with the severity and likelihood criteria.

Regards
Prads

Thanks for the recent private messgae asking me to keep my opinions to myself.

I was simply saying that there are many mnay types of the matrix you want on google. Just a click away. So suggested that if you couldnt find one to suit amongst those, you would probaly not be able to get one from anyone else as you obviuosly have a specific need. So writing your own would probably be the best option.

I think that is a very reasonable suggestion.

Thank you all for the 'Google' lead!

Still didn't find 8x8 matrix criterias. Maybe I'm using a different google :).

I would not be creating one, as I prefer a 5x5 one. I merely wanted to have a look at it.

Thanks anyway.

Regards

Thank you, Jay!
Truly appreciate it.

Regards,
Prads

Ian,

I agree with you, that is why I requested Prads to provide context to his queries. I work for an organisation that uses the Exxon Mobil OIMS Risk Matrix, meant for Oil & Gas/downstream refining & Chemicals activities.

An intersting presentation on the "Risk Matrices -The Good, the Bad and the Ugly:
Common Pitfalls in their Design and Use" , although one has to understand context is at:-

http://isafe.grid.net.sg...trices_good_bad_ugly.pdf

A larger risk matrix gives more discrimination in your risk assessment results. However that doesn't imply that they are any more precise.

Often in the process industries, where 'larger' risk matrices seem to be used, risk targets are set using the HSE document 'R2P2' - Reducing Risks, Protecting People.

Within this document risks are presented in terms of frequencies e.g. 10^-3 for workers, 10^4 for members of the public, 10^-6 for ALARP/Broadly Acceptable criteria.

In process industry risk matrices often 10^-1 and 10^-2 is also used.

Consequences are often 5 or 6 categories - from 1 meaning trivial consequences, up to 6 meaning multiple fatalities.

By also using statistical data for frequency of leaks from pipes and tanks/vessels etc - a risk assessment can then be pitched at a level to give an agreed credible score.

Again, I emphasise that it still only gives an order of magnitude answer, but nevertheless there is some engineering/scientific logic/analysis into the risk assessment result - not quite a total guess!!