Schaff Trend Cycle or STC is a forex trading indicator that was developed in the 1990s by Doug Schaff. He based the Schaff Trend Cycle on the fact that, like prices, trends also demonstrate patterns of lows and highs in a repetitive manner. STC is a combination of the Moving Average Convergence/Divergence (MACD) and Slow Stochastics. The MACD that has been reputed as a trend indicator is widely known for its slow responsive signal line. The STC, with its improved signal line, provides traders with timely warning signs, enabling them to detect currency trends.