These scans find stocks which can be considered oversold based on Stochastic or by being at or below the lower Bollinger Band. It's critical to note that oversold can remain oversold for quite a while. Therefore, being oversold in & of itself should not necessarily be considered a buy signal. Checking whether or not a stock is trending (use ADX, RSI, the slope of the trendline, etc.) can help in the determination of how much weight to put on an oversold condition. You may also want to consider whether the stock is near a support level, like a major moving average or an old low.