The author writes "user testing is probably your best bet. But if you’re a knowledgeable and experienced designer who can think about problems from the user’s perspective, then you can solve this problem through design analysis."
This is so wrong. Actually design analysis can turn out to be completely wrong. You need to test it, get some numbers, and then you can claim that conclusions of your analysis are correct. Right now it's just a claim that may or may not hold.
The author writes "user testing is probably your best bet. But if you’re a knowledgeable and experienced designer who can think about problems from the user’s perspective, then you can solve this problem through design analysis."
This is so wrong. Actually design analysis can turn out to be completely wrong. You need to test it, get some numbers, and then you can claim that conclusions of your analysis are correct. Right now it's just a claim that may or may not hold.