Why does Aristotle consider plot the most important constituent of drama?
Plot is the most important element of drama much as argument is the most important element of rhetoric. Tragic mimesis, for Aristotle, is imitation of a single complete action of a certain magnitude; plot is the "action" of the play. It is plot that gives tragedy its beginning, middle, and end, unity and completeness. If a plot is loo complex, the audience cannot follow it but if it is too simple, it lacks magnitude. Also, it is the events, or plot sequence of tragedy, unfolding around a character that serves to arouse fear and pity in an audience and effect catharsis.