ARTICLE SYNOPSIS ...The Relative Strength Index by J. Welles Wilder, Jr. The Relative Strength Index (RSI) is a tool which can add a new dimension to chart interpretation when plotted in conjunction with a daily bar chart. Some of these interpretative factors are: Tops and bottoms are indicated when the RSI goes above 70 or drops below 30; Chart formations which often show up graphically on the RSI may not be apparent on the bar chart; Failure swings above 70 or below 30 on the RSI scale are strong indications of market reversals; Support and resistance often show up clearly on the RSI before becoming appare...