Head and Shoulder Bottoms are one of the most common and reliable reversal formations. It is important to remember that they occur after a downtrend and usually mark a major trend reversal when complete. While it is preferable that the left and right shoulders be symmetrical, it is not an absolute requirement. Shoulders can be different widths as well as different heights. Keep in mind that technical analysis is more an art than a science. If you are looking for the perfect pattern, it may be a long time coming.