ok, Fixittt does have a very valid observation
the presentation should be sufficiently straightforward that it can be understood also by those without a great deal of technical expertise
but such simplification needs to be done
after the testing, not before
so if one wishes to discuss (good) testing, sorry but it will necessiate some rigor
(feelgood kinda stuff I'll leave to others)
Cyco-Dude (in case you've not seen them)
heat die simulators
here and
here