" there are also two kinds of error. The first is when a doctor diagnoses a tumor that isn’t actually there. This is sometimes called a Type One error: an error of commission. The second kind is when a doctor fails to diagnose a tumor that is there. This is called a Type Two error: an error of omission. It is possible to reduce one kind of error while simultaneously increasing the other kind by altering the “evidence threshold,” as in the criminal justice system. But this trade-off should not obscure the fact that it is possible to reduce both kinds of error at the same time. That is what progress is ultimately about. "

― Matthew Syed , Black Box Thinking: Why Some People Never Learn from Their Mistakes - But Some Do