The first priority is Purpose because it's the
driving force behind the others. Focus and
Development are next because Focus has to do with
choosing and staying on a subject and Development has to do with
meaningful about it. Organization and Coherence
come next, because they help make that meaning more accessible to
the reader. A sense of Audience, in the particular sense,
helps fine-tune this some more. And finally, Style and
Mechanics are the forms that put a polish on the content.
While each of these qualities are defined independently here, it
is important to remember that they are actually so interrelated
as to be inseparable. A weakness in any one makes it hard
to get all the others correct.