Ditto for correctness, importance, and strength.
In effect the four components are like numbers you
can multiply together to get a score for
usefulness. Which I realize is almost awkwardly
reductive, but nonetheless true.
PERRY: Understanding Poetry, by Dr. J. Evans
Pritchard, Ph.D. To fully understand poetry, we
must first be fluent with its meter, rhyme, and
figures of speech. Then ask two questions: One,
how artfully has the objective of the poem been
rendered, and two, how important is that objective.
Question one rates the poem's perfection, question
two rates its importance. And once these questions
have been answered, determining a poem's greatness
becomes a relatively simple matter.
Keating gets up from his desk and prepares to draw on
the chalk board.
PERRY: If the poem's score for perfection is
plotted along the horizontal of a graph, and its
importance is plotted on the vertical, then
calculating the total area of the poem yields the
measure of its greatness.
Keating draws a corresponding graph on the board and
the students dutifully copy it down.
:)