Quote from Maverick74:
I use them as price targets and as correction levels. For example, if we get a failed A up or A down, then the other A level becomes a longer term target. They also work great when you get a deep correction and the QTR levels don't hold, usually the yearly level will.
Obviously when a market is choppy and not trending, these levels are golden as they usually will contain 90% of the price action for the year.