Book excerpt: The first new book in a generation to focus on the practical applications of trading with oscillators Oscillators are an essential group of indicators that futures, options, and stock traders have embraced to reveal turning points in flat markets. In this pioneering book, Mark Etzkorn, Associate Editor of Futures magazine, comprehensively discusses the purposes and uses of such important oscillators as stochastic, momentum, Elder-Ray, Williams %R, among many others, then focuses on Relative Strength Index (RSI), one of today's most popular oscillators. Etzkorn reveals how RSI measures the internal strength of a security, how to calculate it, and how to use it to make better decisions about accepting or rejecting particular market signals. Moreover, he demonstrates how investors can adapt, modify, and apply RSI across different market conditions and time periods, and combine it with other indicators, including Contrary Application and Tom De Mark's concept of duration. MARK ETZKORN (Chicago, Illinois) is Senior Editor of Futures magazine, where he focuses on technical analysis and trading software. He has worked in the futures and options industry as a trader and broker at the Chicago Mercantile Exchange and The Board of Trade Clearing Corporation.