That is conventional wisdom; however, for me, I did not even try these F width shoes on, as I knew I wasn't going to keep them (I did not like the balance of the shoes). I think it also depends on how the last fits you. If a last fits a little long, then sizing down 1/2 size and up a width would probably work. With all that said, it really does depend on the person/foot. I've worked to figure out my correct sizing via a fair amount of (expensive) trial and error.