Want to learn how to do something? Ask someone busy doing it.
It's nice to find my own bald assertions validated like this; "Egri analyzes the construction of a hero; he delves into why people act the way they do. He shows why the author must start with a basic premise. Egri hammers home the importance of developing the central conflict on the basis of the behavior of your main character — this notion is central, but too often falls by the wayside."
The more real seeming the entire (or at least the principal) cast of characters is, the more realistic and natural will be the actions they take to achieve the goals I set for them in the story outline. Central to that is the main character, who presumably must be most fully developed of all.
Yet another addition to the personal library. Hello; Barnes and Noble ..?