"blind test" doesn't work. Read "blink: The power of Thinking without Thinking" by Malcolm Gladwell.
He certainly raises some questions about blind tests compared to expert opinion, but as far as repeatable, replicable, methodology goes, my trust is in the blind test.
Please explain.
http://www.ted.com/talks/malcolm_gladwell_on_spaghetti_sauce...
Gladwell means that people don't always know what they want (or wont be able to tell you).