Thanks! For me 2x2 is a lumber grade. And yes, I agree, I am trying to exclude a large class of 2x2s. I don't consider "false positive, false negative, true po

Thanks! For me 2x2 is a lumber grade. And yes, I agree, I am trying to exclude a large class of 2x2s. I don't consider "false positive, false negative, true positive, true negative" as a more insightful classification of the four quadrants than just saying "test=positive condition=negative" etc., and the point of such a diagram is not to tell a story to your management. (In this particular case it's usually to point out that by making the test more or less stringent, you have a tradeoff between false positives and false negatives.) Similarly, a 2D graph can also be used to depict a cost-benefit analysis for a bunch of different options, to try to emphasize "I think this is a low-cost high-benefit remediation strategy compared to those other strategies", I don't regard this as a "proper" 2x2, it's just a persuasive tool.