Hi Charles
Yes it is same article but the RA is no clear to me how to conclude and close it.....
This matrix is presumably a mixture/combination of linear and non-linear scoring methods. The latter can be developed by one or more of a variety of techniques such as intuitive, exponential, algorithmic. Both Qualitative and Quantitative aspects are often "mixed" together.
The various categories shown are probably subjectively determined (ie intuitive guesswork ).
Offhand, the only way to know more is likely to require access to the referenced source document (= book). (Unfortunately seems not available for review on IT).
If you wish to get an idea of just how complicated risk matrices can be, try this post/thread -
https://www.ifsqn.co...ix/#entry108940
And regarding the (many) limitations of risk matrices -
Uncertainty of Risk matrix,2017.pdf 1.61MB
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