wouter van ooijen wrote:

>> Ok, I agree at this level, but I would still take easy steps to
>> reduce/eliminate lower risk elements if there was a higher risk element
>> that was hard/impossible to reduce.
> 
> Why? Reduce a risk from 1:100 to 1:99, where both figures have a 50%
> reliability interval of, let's be optimistic, 10?

Maybe think in an electronics analogy. Say you want a 99.5k resistor. It
doesn't help much to put a 20M resistor in parallel to a 100k resistor if
the 100k resistor is a 5% resistor. 

If 5% is enough, the 20M resistor is not necessary. If 5% is not enough,
the problem is not whether or not to add the 20M resistor, it is how to get
the 100k resistor up in accuracy (or how to individually calibrate the
devices).

Gerhard

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