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Taking it on one step at a time

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agile

Anyone can write user stories. It’s the product owner’s responsibility to make sure a product backlog of agile user stories exists, but that doesn’t mean that the product owner is the one who writes them. Over the course of a good agile project, you should expect to have user story examples written by each team member.

Also, note that who writes a user story is far less important than who is involved in the discussions of it.

source : http://www.mountaingoatsoftware.com/agile/user-stories