A design narrative is a semi-structured story that illuminates a particular attempt to address a complex challenge. It can be told from the view (and in the voice) of the designer, or the user (the learner or teacher, in the case of learning design). A design narrative recounts an incident where the designer attempted to bring about a change in the user's world. It details the context of this incident, the objectives of the design and the user, the actions they took and their result, the obstacles they encountered and how they dealt with them.
You can read more about design narratives at: http://www.ld-grid.org/resources/representations-and-languages/design-narratives and in the papers below. You may find the embedded presentation helpful, as well as this example: http://www.ld-grid.org/resources/learning-designs/pi-project-healthy-eating-activity/healthy-eating-design-narrative
You can browse the existing design narratives in ILDE to get a sense of what we're looking for.
Mor, Yishay (2011). Design narratives: an intuitive scientific form for capturing design knowledge in education. In: proceedings of the Sixth Chais Conference on Instructional Technologies Research: Learning in the Technological Era, 17 Feb 2011, Raanana, Israel. http://oro.open.ac.uk/30299/
Mor, Yishay (2013). SNaP! Re-using, sharing and communicating designs and design knowledge using scenarios, narratives and patterns. In: Luckin, Rose; Goodyear, Peter; Grabowski, Barbara and Winters, Niall eds. Handbook of Design in Educational Technology. London: Routledge, (In press). http://oro.open.ac.uk/33861/