"Beware of technical analysis, my son! The jaws that bite, the claws that catch!" Had Lewis Carroll been an investing aficionado, he might have cautioned investors about technical analysis, instead of the Jabberwock and the Jubjub bird. He didn't, though, so permit us.

Technical analysis is often contrasted with fundamental analysis. Technical analysis dwells on charts of stock price movements and trading volume. Fundamental analysis, on the other hand, focuses on the value of companies, studying such things as a firm's business, earnings, and competition. While investors from the fundamental school want to understand a business from the inside out, technicians mostly remain on the outside, observing how the stock behaves in the market.

Technicians have defined many patterns in the charts they study, imbuing them with much significance. There's already a head-and-shoulders pattern and a cup-and-handle pattern. Perhaps next we'll see an ostrich-and-eggbeater pattern. These patterns do exist, but they don't necessarily mean anything. Imagine someone discovering that on presidential election days, whenever the skies above Fresno were cloudy, Republican candidates won. Like many patterns, this would be a randomly occurring one, a coincidence. For you to bet any of your hard-earned savings on this would be nothing more than gambling.

Investors who use technical analysis are really betting on the psychology of the market, as they scrutinize investor behavior. They try to determine where the big, institutional money is going so they can put their cash in the same places. Imagine Warren Buffett, chairman of Berkshire Hathaway (NYSE:BRK-A) (NYSE:BRK-B), trying to follow this short-attention-span crowd instead of seeking, buying, and holding great companies for the long term. Imagine the taxes and commissions. Yeesh.

It's amazing to think that technicians might study a stock chart, see a particular pattern, determine that the stock is "breaking resistance," and then buy shares. All this would very possibly be done without ever understanding what the company does or what its prospects and circumstances are.

Most of us at Fool HQ prefer to focus on the fundamentals. For example, if you find a company quietly selling more and more prefab igloos, increasing its profit margins and earnings, trading at a discount to its intrinsic value, and going unnoticed by Wall Street, consider snapping up shares. Don't worry about what others are doing. The true value of great companies is eventually recognized.

If you want to hear opposing points of view, drop into our Technical Analysis Trading discussion board. Because there are opposing points of view, and you'll get an earful from those who think I'm full of hot air.

Here are some more articles on the topic:

  • In "Investing Alchemy", Joseph Khattab reveals the results of an experiment testing T.A. with stocks such as Coldwater Creek (NASDAQ:CWTR), Apple (NASDAQ:AAPL), and Sears Holdings (NASDAQ:SHLD).
  • In "Chart Your Way to Easy Street!", Matt Koppenheffer explains how he might use T.A. to invest in Advanced Micro Devices (NYSE:AMD).
  • In "Is Technical Analysis Voodoo?", Bill Mann offers his view on the approach.
  • And in "How Contrarians Use Charts", Mike Norman discusses his experience with steel company Mittal (NYSE:MT).

To learn more about investing Foolishly, visit our Fool School. Or check out some of our inexpensive and well-regarded How-To Guides, which feature money-back guarantees.

Mittal and Berkshire Hathaway are Inside Value recommendations.

Longtime Fool contributor Selena Maranjian owns shares of Berkshire Hathaway. The Fool has a disclosure policy.