[mongol]

I think the list is more relevant for how it describes professionals, and less relevant for how it applies to amateurs. From professionals we expect a certain level of efficiency and proficiency. From amateurs we generally don't but that does not mean there are no skilled amateurs in a field.

[atoav]

E.g. Sir Isaac Newton who was a professional mathematician but an amateur physicist.

Professionalism to me means a few things: - you earn money with the thing you do - given a outline of the project you can judge how long it will take - you also care about communicating your work - once you agree to do something, you do it unless you can’t