The six Venn diagrams of testing. In only one of these do we know the truth about the product (diagram 6). Even in this case, we don’t actually know that we know everything. This illustrates the point that the goal in testing is not to uncover the truth; rather, the goal is to define and follow a strategy (allowing for some alteration as new things are learned). Of course the hope is that these two things align.
the testing graph 
I really like your graphics style. How would you visualize when people have different ideas of what is going on?
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