'rule of thumb': Okay, what tricked me here was, that at least in my idiom of German their exists beside "Faustregel" also "Daumenregel", with slightly but sigificant diffrences. While a "Faustregel" is a reliable and approved approximation that does shorten the calculation significantly, a "Daumenregel" is just the utterance of the feeling someone has on the subject under investigation. So while a "Faustregel might be a bit beside the real result it does point into the right direction for sure, in contrast a "Daumenregel" might be complitly of track.
Respectfuly
Findegil
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