Why the need for story mapping? Do Jason Ohler's methods help us?

Ohler (2008) suggests that story mapping compels story tellers to create stories with rhythm and forward motion - and a clear beginning, middle, and end (pg.85, para.3). The author suggests that story mapping goes beyond both creating a story core or a story board  by focusing on the story's emotional sequence rather than the stories action sequence. Once again, I can see how Ohler's methods might be extremely useful in story creation.

Fig.1. Leaner emotional states can follow story sequences (Ohler, 2008, pg.88, Fig.6.2

Why do I agree? Without story mapping, it might be too easy to create long chains of learning units without out a clear mood or logical transitions between the units.

Because we know that a story map should reflect the learners emotional state at various stages in the story or learning sequence, we might also use such a map as a way of checking the quality of any particular DST. The learning story should be fun and enjoyable; clearly taking the learner from emotional state, to emotional state. In Figure 1 above, we can see an example of a story map - and how it captures the mood or emotion of the story.