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Even though having a product vision is important, maybe even more important is the product owner’s ability to come up with a good list of user stories for the product backlog.
So if you feel that you or your product owner are not skillful at gathering requirements (yet), do not hesitate to go back to Chapter 4, “A Visual Requirements Gathering for the Product Backlog” to review how to gather requirements that can easily be understood by developers and converted into tasks.