I can provide an example of one specific case where a difference between model values and measurements revealed a source of error in the measurements. (skepticalscience.com)
We can not reveal sources, but the info does come from someone we consider to be extremely trustworthy. (gonintendo.com)
I do wish step 1 would have been: reveal the source for the mattress cover because that is what truly gives this bamboo gem its custom look. (stylebyemilyhenderson.com)