The primary theory behind harmonic patterns is based on price/time movements which adhere to Fibonacci ratio relationships and its symmetry in markets. Fibonacci ratio analysis works well with any market and on any timeframe chart. The basic idea of using these ratios is to identify key turning points, retracements and extensions along with a series of the swing high and the swing low points. The derived projections and retracements using these swing points (Highs and Lows) will give key price levels for Targets or Stops.
Harmonic patterns construct geometric pattern structures (retracement and projection swings/legs) using Fibonacci sequences. These harmonic structures identified as specified (harmonic) patterns provide unique opportunities for traders, such as potential price movements and key turning or trend reversal points. This factor adds an edge for traders as harmonic patterns attempt to provide highly trustworthy information on price entries, stops and targets information. This may be a key differentiation with other indicators/oscillators and how they work.