"... Prototyping is simultaneously an evaluative process -- it generates feedback and enables you to make midflight corrections -- and a storytelling process.

"... Prototyping is simultaneously an evaluative process -- it generates feedback and enables you to make midflight corrections -- and a storytelling process. It's a way of visually and viscerally describing your strategy ..." Heard this message before. Prototypes allow a "premortem" of a future product.