Jane is supporting the launch of Product X, a new release her company is really excited about. She is on the marketing team. Armed with her launch checklist, she schedules a meeting with John, the product manager. At the meeting, John answers all of her questions, draws a market segmentation on the white board, and talks about the key features and why they are important. Jane takes lots of notes and asks John to review what she sends him.
I consistently get asked questions like the following: "Just look at Facebook/Amazon/Google (usually one of those three). Don't you think they have a terrible product? How could they possibly be so successful?"
I have written earlier about the differences between user prototypes (simulations intended to test the user experience), and live-data prototypes (actual code intended to send live traffic to in order to test real behavior). See http://www.svpg.com/product-discovery-with-live-data-prototypes/