This article has been rewritten - The new version is available here.
The P-F interval is a deceptively simple idea. Deceptive, because it takes for granted that we have previously defined "P" (the potential failure). Of the two concepts, “P” and “P-F”, it is the former, however, that poses the greater challenge. Therefore, before addressing the P-F interval, we need to determine when and how to declare a potential failure.
This article has been rewritten - The new version is available here.
The P-F interval is a deceptively simple idea. Deceptive, because it takes for granted that we have previously defined "P" (the potential failure). Of the two concepts, “P” and “P-F”, it is the former, however, that poses the greater challenge. Therefore, before addressing the P-F interval, we need to determine when and how to declare a potential failure.