From Market Wizards:
The best trades are the ones in which you have all three things going for you: fundamentals, technicals, and market tone. First, the fundamentals should suggest that there is an imbalance of supply and demand, which could result in a major move. Second, the chart must show that the market is moving in the direction that the fundamental suggest. Third, when news comes out, the market should act in a way that reflects the right psychological tone. For example, a bull market should shrug off bearish news and respond vigorously to bullish news. If you can restrict your activity to only those types of trades, you have to make money, in any market, under any circumstances.