In his book “Long Term Secrets to Short Term Trading”,Larry Williams introduces the concept of Greatest Swing Value or GSV.The technique trys to catch the reversal day of a short term trend. The basic idea involves volatility breakout and it is about the concept of failed swing.The critical element is to only take a buy signal after down days and sell after up days. Example for uptrend: (i)If today close is greater than the close of five days ago(uptrend),we look at those previous “n” days where C>O(updays) and then for each day with that characteristic we calculate the down swing(the difference between Open and Low) (ii)Then we calculate the average down swing(“avds”),multiply it for a factor(1.8),and subtract it to tomorrow open: a:=O-1.8*Ref(avds,-1) (iii)If tomorrow price drop down “a” level,we’ll sell Example for downtrend: (i)If today close is minor than the close of five days ago(downtrend),we look at those previous “n” days where C