These scans can be used to find stocks which are pulling back (up or down) in the short term against a longer term trend in the opposite direction. The "up / down x days in a row" scan are exactly what they sound like, but their parameters can be tweaked or they can be used in a combo scan in order to identify stocks which are actually pulling back (retracing) as opposed to continuing to rise or fall in a major uptrend or downtrend.