How to make the fly fish most effectively

I have met a whole bunch of great people, trough my manny fly fishing adventures.

And there is always one subject which is brought up, when fly fishers get together after a long day at the river.

How to make the fly fish most effectively, in different conditions??

Then a good friend mailed me this picture, and it shows it all quite OK, even thought the picture quality wasn't 100% perfect.

Have a look, maybe you can use it, maybe you can learn something from it - or maybe you totally disagree !!! - Anyway here it is :O)

PS. I know it is in swedish!!

- But it describes the temperature to the left (red = hot / green = cold) - and how the sizes of the fly's changes during the different temperatures - and how deep the fly should fish under these different conditions. Quite simple to understand.

Tight lines ¸¸.·´¯`·.¸ )><((((º>