Looking again at the classic formula on page 13 of "Leo" (or, indeed, once again
here), it wasn't clear to me how the Form and the Formula actually matched up. Then I realised that they don't at all. In fact the formula* is simply included (by Leo) as an example of the JCAHO model. Another red herring, then!
Meanwhile, the Form calls for simple addition of the scores.
Meanwhile,
here's another resource. The same good old stuff, just (nicely) presented in a different way (Win-4 ... or
Six-Sigma?).
And
here's yet more bedtime reading!
*
This is a variation to what I believe is known as the FSV. That is, the Fennigkoh and Smith Variations, from the classic paper published by them in 1989 (and from which most of the subsequent work on Risk-based PM is founded).
