The brief description here - http://writing.colostate.edu/guides/research/observe/com3a2.cfm - is a good place to start. A good basis for understanding can be found in Robert Fulford's "The Triumph of Narrative: Storytelling in the Age of Mass Culture". Jerome Bruner's "Acts of Meaning" is a more academic foundation, as are Clandinin & Connelly's "Narrative Inquiry" and Richardson's "Fields of Play".