Primarily because "correctness" is likely to be subjective or difficult to define, while "accuracy" is not. That said, the terms more often used here are "prec

Primarily because "correctness" is likely to be subjective or difficult to define, while "accuracy" is not. That said, the terms more often used here are "precise, but not accurate" (http://blog.minitab.com/blog/real-world-quality-improvement/accuracy-vs-precision-whats-the-difference http://blog.minitab.com/blog/real-world-quality-improvement/...) but note that this uses a different meaning for accuracy than parent used. For example, say you use 22/7 to derive the value of pi. You can easily calculate it to 60 or more decimal places. You'll be very precise. However, you won't be accurate because your methodology of using 22/7 is flawed. It's also very easy to create more precision: just keep calculating. On the other hand, it can be very difficult to create more accuracy: How do we even measure pi to be able to confirm the ratio is correct?