The first sign of an impending trend reversal is often the breaking of an important trendline. Remember, however , that the violation of a major trendline does not necessarily signal a trend reversal. What is being signalled is a change in trend. The breaking of a major up trendline might signal the beginning of a sideways price pattern, which later would be identified as either the reversal of consolidation type. Sometimes the breaking of the major trendline coincides with the completion of the price pattern.