The McClellan Oscillator measures the momentum of the AD Line or Net Advances. As a momentum oscillator, it is prone to the pitfalls of normal momentum oscillators, such as MACD. Bearish and bullish divergences can produce some great signals, but these signals are certainly not fail-proof. The same is true for breadth thrusts and crosses into negative or positive territory. Like MACD, the McClellan Oscillator is a rather volatile indicator that produces many potential signals. Signals should be confirmed or refuted with other technical indicators and chart analysis. Chartists can also study past behavior to get a better handle on future behavior.