I heard a lot about "customer development" and how important it is. Steve Blank and others say over and over again: "do custdev before writing a line of code".
Okay, but what about real life examples? I can't find any. It looked like it worked solely in this way:
So... where is custdev here? "showing to a couple of friends" is not definitely. Can you please point me to some real life examples? Maybe you saw it in blogs, articles, stories?