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"Frequently updating their artifacts (Vision, Personas, Story Maps) as they discover meaningful change [matters]." agilepainrelief.com/notesfromatooluser/2015/07/vision-to-user-stories-what-is-the-best-flow.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+NotesFromAToolUser+%28Notes+from+a+Tool+User%29#.VaPgBBOqqko