Wilder's back ...by Technical Analysis, Inc.
An in-depth interview with J. Welles Wilder, developer of the popular Relative Strength Index and other technical indicators.
It's not often that truly original discoveries are made in technical market analysis. J. Welles Wilder,
however, lays claim to an entire collection of systems that have reshaped contemporary commodities
trading and analysis.
Wilder's methods first came to light in 1978 with the publication of his book, New Concepts in Technical
Trading Systems. The book is required reading among technical traders today, and many of its tools, such
as the Relative Strength Index, are considered essential.
In 1983, Wilder's life took a completely different tack when he met Jim Sloman, a person he describes as
exceptionally gifted. Sloman had been a stock broker and a commodity trader at one point in his
professional life and introduced Wilder to his fundamental discovery about order in the markets. Sloman
called his discovery Delta, a Greek letter from a word meaning door. Working with Sloman, Wilder
computerized Delta and founded the Delta Society International to share the discovery and ensure its