First drafts will not be graded. You can revise your papers as often as you want, but you can only revise a paper once to improve your grade. People turning in triple-spaced papers in really big type will be asked who they think they are kidding. People asking whether a bibliography counts as a page for the length requirement will be brusquely waved away. People asking whether a title page counts will be taken out and shot.
Concept addresses the strength and clarity of the paper overall.
Analysis addresses how well you've developed and supported your paper. Structure addresses how well you've led the reader through your paper. Style addresses how the paper sounds.