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The Testing Unknown Unknowns - by Jit Gosai
I like visualising the model not in a 2x2 matrix but linearly with just three categories: Known-knowns, Known-unknowns, and Unknown-unknowns. I tend to leave off Unknown-knowns to keep things simple. Some teams also combine these into the Unknown-unknowns. When you visualise this grid linearly, you see how each relates to the other. I find the ...