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.
Testers gain and then hold information about a product. This information can be distilled into an answer to the question “who would be upset about this?”. The answer to this question determines who to share that information with, and when.
Above is a visual representation of the function of a tester.
In this graph, the term ‘areas’ could mean almost anything – behaviours, scenarios, environments, actions, sections, features… etc.