Revision Strategies

This is another article that attempts to quantify the practice of writing, something I'm still not sure if I'm comfortable with or not. For example, have studies been done on painters, analyzing the size and directionality of each individual brush stroke? If there have, they are probably taken as benign studies of habit, rather than the investigative agenda this article takes on.
Though the analysis of the different revision styles are interesting, I think the discrepancies between the two styles can be explained by one thing: purpose. Experienced writers in this case were defined as people who wrote professionally, for a living. The writing experience of the student writers on the other hand,was limited mostly to school assignments and related work. It is logical that two completely separate reasons for a practicing a skill would yield two completely different methods of doing it. Student writers are not writing for themselves, they are writing for the approval (and grade) givenby someone else. So they write what they think their audience wants to hear and revises likewise, to make things better. The professional, on the other hand, has developed a more personal relationship with writing, writing is beneficial to them, and so they are inclined to explore it further and revise in much the same way, to deepen and solidify their thoughts so as to best express it.