Volume is generally greater in generating the first top than in making the second. A double top is simply two peaks. After the second peak is formed a breakout through the base is a signal of a possible reversal of the trend in prices. In the case of a double bottom, two troughs form and an expectation follows for the possibility of a trend reversal if the market price rises through the base. Waiting for confirmation is important for trading double tops.
Volume is usually higher on the left peak than on the right peak.
The confirmation point is the base of the peaks. A breakout through the baseline is more convincing if accompanied by higher volume and predicts a continuation of the trend in that direction. Price projections can be made by determining the price difference from the neckline to the first peak and then subtracting that value from the price at the time of penetration from the neckline. Price projections are estimates of the potential near term movement of the price once a breakout has occurred. When the price of the tradable is low, the best approach in making price projections is to use percentages.