Buy Signal: The top Bollinger Band rises toward a test of the intraday high as Worldcom drops. This sharp divergence signals the eventual breakout after price finally reverses off of the bottom band. Watch band slope closely when bars return to test important highs or lows. It often reveals the time and force needed to push price through a S/R barrier.

The skilled eye watches constricted bands in real-time to estimate the buying or selling force required to push them out of the way. They work extremely well during the second test of an important high or low. When markets finally break out, expanding bars often shoot into the band's edge where congestion forms a flag until the BB allows further movement. Bands constrict tightly around narrowing price in sideways markets. Apply NR7 methodology here to anticipate an impending positive feedback event.

Bollinger Bands signal early warning of trend change. Sharp price movement forces bands to expand outward. When these active markets finally turn sideways, the bands slowly tighten and roll toward price. Time passes and the BB door closes on rapid vertical movement. Experience enables the swing trader to quickly estimate the time required before bands will tighten and plan accordingly.

Strong buying or selling may push price well outside a band. A tall bar can even print completely through the barrier in extreme conditions. General tactics suggest that violent reversals often follow these major band violations. But trading against these events carries risk since markets can print a short series of these volatile bars before the reversal takes place. Also note that this price action rarely occurs during intraday markets, except at the open.

Reduce risk by dropping down to the next lower time frame and waiting for a reversal there before executing a countertrend position. Odds also improve if the thrusting bars run into other forms of S/R that allow cross-verification for the entry level. Stay defensive during the trade. Once price returns within the band's limits, the underlying trend can reappear quickly unless the pullback generates other reversal signals. Look for Dark Cloud Cover or a similar candle pattern that fills any gap created by the bar outside the band. This complex setup can produce windfall profits if managed properly.

Swing traders work the quiet middle ground of Bollinger Bands for consistent profits. Build strategies that enter countertrend positions at one band and exit at the other. These swing setups face far less whipsaws than breakout entries at band extremes. Keep in mind that the center band presents a natural profit obstacle that needs special consideration when calculating reward: risk. Make sure a safe exit near this center point still produces a decent profit for the trade.
 

Multiple Support-Resistance: A broad range sets up profitable swing conditions for KLA-Tencor. This 13-bar Bollinger Band combines with simple horizontal S/R to uncover natural reversal zones at band extremes. Enter a countertrend position when the prior bar prints a candlestick reversal outside the band line. Wait for a break of the center band if no clear signal arises. Exit if price does not expand quickly in the other direction or if the signal fails and the candle shadow gets taken out. Watch S/R closely for positive feedback that will eventually carry price out of the sideways market.