I can find a pure chart quite frustrating. My logical side wants to know more - I battle with the "its only the price you need to know, stupid" approach.

So now, I am a happier camper, and you can see why:-

Take Sasol - I found a fair value of 340 a few weeks ago (see Sasol Valuation)

yet here is the price - leaving me in the dust:-

To see what else may be of influence, I can add an overlay of the share's eps (with a constant multiple, of my own choosing)

OK, so it seems that the eps is predicted a year ahead by the price, and maybe there is something else in the mix. So I add an oil price. Oil in rands, not dollars.

And look now:-

So I now see an elaborate option on the rand oil price! 

See also Carbon tax impact 

And for more on the charting tool, visit Share Magic Group

Cheers

Stuart