Structural Term

the kind of activity employed to arrive at a solution to the Overall Story's problem, act by act

As the Overall Story progresses act by act, it covers the Overall Story Perspective (the Perspective created by matching the Overall Story Domain with one of the four Classes) Type by Type around the quad of Types which it contains. These four explorations make up the four acts and describe the kinds of things that will have to happen in order to arrive face to face with the Overall Story Problem.