[torero]

I would have to agree with kiwi on many points here. Most traders one time or another use TA, but it's more than TA that cause them to lose, namely psychological makeup that cannot keep them disciplined or consistent enough to find out if TA really works or not. Most also don't make a carefully laid out plan to test out their TA-based strategies to make sure they work or not. But I think the most important factor is that most don't know how to use TA properly. In the end, they interpret them to fit their beliefs, exactly as kiwi says, "wired incorrectly". This is the biggest hurdle to overcome, not TA itself.