Catia V5 | Catia V6: Class A Methods - Blend Surfaces 

That's the ticket - Thank you for this. There is a lot to take in in this short video. Brilliant.

That´s a really nice way to drive the geometry!

Class A surfacing, thanx for the gr8 video. How can I see the update continuously while changing the position of the parallel lines as shown by you? Whenever I change those parallel lines, I am not able to see the change in blends at the same time.

What do you mean about "stable elements" ?