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in some threads as
@StevenVickersgave you some very effective and good tips.
When I did my first works of this kind, the best definition of class A surfaces was given to me by a customer: it must be 'bella' (beautiful in english ).
More than a mathematical definition a class A surface is defined whit what you must NOT to do, never use three sides surface, for example.
Some customers require specifications such as never using Blend command for radii higher than 5 mm, an so on.
I design small parts, I don't work in the automotive industries, I try to work on the details. Below only the red one is a blend.
Class A, as Cesare states, are surfaces that look good.
Mathematically it is generally seen as a collection of surfaces were the reflection lines are clean, usually this means curvature continuous (G2) or higher continuity (G3) between surfaces and no odd indentations/bulges. But it is more an aesthetic evaluation.
Main commands to get to know are the surface analysis ones such as reflection lines and highlight lines.