John Walker is always a good read, and I had missed that essay before. It seems to be the same message that some of the writings around Ycombinator are saying that you let the customers tell you what they want, and it may not be what you first think. So perhaps we think of this approach as making the point of first feedback as early as possible. So far as I can recall, there was no market research for the Apple II.<p>My favorite reference from the article is "...I have not failed. I've just found 10,000 ways that won't work."