Some of the best work I have ever seen is made by some one who is not a member of any organisation I know of, and no one else has ever heard of her ... yes HER ! She sets her own incredibly high standards and people who buy her work are judging for themselves , and a "certificate" of an organisation which they have never heard of will make no difference what so ever ! I have seen work by well known turners ( amongst other turners only ) with "accreditations " to their name , which I find uninspiring and of mediocre quality , ( super glued cracks , chucking marks , screw holes filled etc etc )