One of the threads that runs through Blink is that preferences are inherently unstable, and that when asked about they like or choose something people won't know or they will make up stories. Given that what people tell us they want and like is not reliable, particularly about new things and ideas, what does this say about requirements gathering and definition process? Is/was this part of the dot com bubble problem due to developers writing code for what people said they wanted, when they themselves did not know on a conscious level?
On a practical note, I think this speaks to iteration and prototyping as an answer to the unstable preference problem.
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