Comment by dsawler

I think "great design can't be tested" is wrong. All design has consequence. If I make an add to cart button on an ecommerce site purple, I can test that to see if it performs better than the red add to cart button. Yes, these decisions (of choosing red or purple) can come from a designer understanding his/her audience, but should never be just taken at the designer's word... it should always be tested to make sure the designed solution is the right one.