Well, there are so many tools that are used in TA. Fifty years ago it was considered Voodoo but started getting a good rep in the 70's and the major houses hired a technical analyst. Since then it has exploded to include Candlesticks, Bollinger bands, Point and Figure, Stochastics, and the list goes on and on. John Bollinger, whom I was lucky enough to meet at a TA meeting in the 90's, is a relatively young guy so he invented that tool not too long ago and the art keeps growing every day.
TA actually does go back a long time.....Elliot (of the Elliot Wave Theory) used his theory during the 30's. TA's just didn't get alot of respect like they do now (not necessarily on this board but on places like CNBC and Bloomberg).
To answer your question, there are many tools and what I look at (10 week ma/20 week ma crossover) to determine a general buy or sell signal is not what another technician may use. He may use another signal altogether. If you look at www.americanbulls.com he uses candlestick signals (although I don't believe in the accuracy of the site as it is impossible to trade as he suggests).
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