Understanding market trend is the most important skill for a company CEO, because it drives company's decision on assets allocation, you can imagine a company still produce a lot of tube TVs while the market trend is flat TVs. Working against the market trend could mean a disaster. Drawing and understanding trend line is the most important skills for traders because it drives buying and selling decision in financial market. Trading without trend line is like driving a car in the jungle where there is no road to see in front and it is hard to make decisions. Drawing trend line in financial market (forex, options, futures, commodities, stocks) is not an art because we are working with real and visible market price data. it can be pointed and drawn exactly within 10 seconds. This book also presents trend line trading strategy by using the correct trend line. This is an old concept in financial market but rarely explain in financial literatures. (If you have bought author's book "Forex Trend Line Trading Strategy, it is hard to win without knowing the trend," you don't need to buy this book - vice versa).