Quote from stalt:
I use trendlines on every trade. If I draw a support trend line and buy at support I will take that trade to the upper trendline and sell right there. If things go against me and my support trendline is violated I sell as one of the main reasons for buying the stock was based on that support trendline. Why would you hold onto a position whne one of your reasons for buying is no longer valid? So in my system the support line acts as a soft stop. If it is violated I sell. Have stocks gone through upper trendlines before? absolutely, but I stick to my method. I think you have to understand trend lines are not absolutes. Think of all market partisipanst with different strategies, time frames and methodology. I like to give my trendlines a small percentage channel on ech sode of them(say 50 cents). If markets are not trending then I will usually sell before a trendline is hit. Usually within 50 to 10 cents of that line. there is no guarantee it will actually get all the way there. I would prefer to take some profit and move on.