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Hi teachers,
I have read in one of my grammar books these definitions:
a) If you simply want to contrast two statements, you use 'although', 'though' or 'even though'.
b) 'However' emphasizes the fact that the second point contrasts with or seems to contradict the first.
c) These words link two ideas and show contrast between them.

I don't see much difference in terms of those definitions. Could you give a better one please?

Eg.
Even though Arthur drives more carefully than he did when he was younger, he is still driving too fast according to Deborah.
He has to work hard — harder than the excavator operators, for example. However, he earns less money than they do.
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Although means in spite of the fact that, joining two contradictory statements together. The order of the statements is unimportant because the conjunction accounts for both points.

Although I had never met her before, she looked familiar.
She looked familiar, although I had never met her before.

On the other hand, however means in spite of that, contradicting something previously stated, so the order of the contrasting ideas is imperative. Like any other conjunctive adverb, however relates what is said earlier in the discourse.

I had never met her before; however, she looked familiar.
Comments  
Aspara GusHowever means in spite of that, contradicting something previously stated
Aspara GusAlthough means in spite of the fact that, joining two contradictory statements together
Hi Aspara Gus,
Thank you very much for your help. I still don't see much difference between them. Though I know what they mean in Spanish, I have to explain, of course in English, when to use one or the other to my students.

TS