Quote from steve46:
If you don't mind I would say a couple of things quickly.
First, I think there is a good mathematical basis for pivots. They represent an average of sorts and because other market participants use them, they tend to work in a way analogous to a "self fulfilling prophecy".
Although I don't find the same utility in Fibs. I understand the claims for their use. Unfortunately I have never read a good or rigorous study that mentions them in a positive light. On the positive side, many people use them, so when they work, I will bet that again it is because of "self fulfilling prophecy".
At this point in life, I figure that a significant amount of value for these tools comes from the psychological comfort that they give traders. All of these tools seem to provide some kind of psychological crutch to the user at first. What I see however is that the longer a person uses them, the more "realistic" they have to be about their accuracy. Neither tool works anywhere near 100% and after a while this causes the user some anxiety and this is probably why inexperienced traders get to a point where they are hesitant to take signals.
So I think you have to put these kinds of trading "aids" in perspective, and the way you do that is to learn as much as you can about them (before trading with them) and observe how they act in a variety of circumstances.
Hope this helps someone.
Steve