Two checking / routinized tips for the basic tester:
- Not doing something – it should
- Doing something – it shouldn’t
Two testing / bespoke tips, for the advanced tester:
- Doing something – it should
- Not doing something – it shouldn’t be doing
See also What if – and Does it Matter? Routinized and bespoke activities Testing AND Checking
Complexity is a Matter of Perspective 
Hi. I get the first three but I don’t think I follow this “Not doing something – it shouldn’t be doing” Can you expound on this? Any sample you can share to help drive the point? Thanks.
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Similar to item three, where a hunch tells you that something is odd. Now Odd Can either be something that is there, and something that isn’t.
The waching machine is a visible oddity, but where is the table?
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