Volume spread Analysis uniquely analyses "activity" on each bar (volume) and analyses what the closing price did as a result. Because 95% of the activity is the professional "Smart Money" Trading Syndicates, this expert system can identify what stance they are taking in the market, ie: buying, selling or not participating. The methodology has been used by the professional trading community since the early 1900's. TradeGuider has computerized it and brought it to the wider market, so retail traders can now even the odds.