1.) The writer tries to discover and understand better the revision process. And the more research he does with his other editors he finds more on professional revising.
2.) They divided editors into groups by knowledge and opinions. So they basically studied each other to see the different opinions. Analyzing was all about different opinions.
3.) Professional editing differs from student in many ways. Professional gets payed and edits 10 times more precise. Student does what he has to for the paper to look good for somebody else. Professional has to make it look and sound good for a lot more people. Plus a student can do whatever they want on the paper a professional has guidelines.