A story about User Stories; Who writes them and how do you control the scope? 

So who writes them?

That depends. In Scrum it is the product owner (the term I use in the rest of this article) who represents the customer(s), and he or she has full responsibility over the list of user stories that comprise the product or system (the product backlog). And since he is one most knowledgeable about the particular domain, usually he is also the one who is supposed to write the user stories. In reality however, it is a combined effort with the team that realizes the functionality. Writing good user stories is not trivial, you know.

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