The laws of mass psychology follow the Fibonacci number sequence. This fundamental thesis can describe the central premise of proponents of Fibonacci techniques, particularly the Elliott Wave Theory. In fact, Fibonacci numbers and ratios can repeatedly be found in price movements. This applies not only to the ratios of trends and corrections but also to the relationships between trend and impulse movements. Fibonacci techniques often serve as an adequate analytical tool for the temporal dimension between highs and lows as well. Karin Roller briefly, concisely, and clearly explains the theoretical background and provides easily understandable examples from practice.