The Great Col. Jeff Cooper coined a fascinating and useful term, PII, ‘Preoccupation with Inconsequential Increments.” To wit, in his own words:

Years ago we coined the appellation, “Preoccupation with Inconsequential Increments,” or PII. This peculiarity lies in attributing importance to measurable deviations so small as to be meaningless. You see it in the people who shoot test groups in rifles, awarding a prize to a group which is only thousandths of an inch smaller than those unrewarded. One sees it in speed records awarded in one-thousandths of one mile-per-hour. One sees it in basketball scores which, nearing the century mark, are separated by less than three points. In all such cases Score A is “better” than Score B, but who cares?

An increment may be termed inconsequential when it has no significant relationship to the purpose of the exercise. Of course if the purpose of the exercise is in itself inconsequential some may not think this to be foolish. A very distinguished general at Quantico once caused the sign to be placed over the exit door of every office asking, in brilliant scarlet and gold, “What are you trying to do?” There was a man who knew more about human nature than most.

The Colonel knew what he was talking about. Know what one is trying to achieve. Beware the obsession with minutia that don’t really matter.

The enumeration of specific examples of PII is an exercise that I shall leave to the reader, who will no doubt find it enlightening.