A Story is a composite of events (accounts of the groupings and interactions of places, peoples and things at specific times). A story is non-fiction if the events are actual snapshots on the continuum of Time. A story is fiction otherwise.
The places, the peoples, the things, the groupings and interactions (in particular the behaviors), the times and the language used to tell the stories are all expressions of Pj Problems. In essence all events are expressions of Pj Problems. Consequently, stories are expressions of Pj Problems.