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The purpose of an ad is persuasion:
to persuade its target audience to respond in some way, to do something
or to believe something, now or later.
Most ads we see simply say, "Buy this."
As a means to this end, ads might entertain us or
inform us, but their basic purpose, their goal, is to persuade us.
Ads may win awards for being funny, interesting, or being artsy.
But, if they don't sell the product, they don't achieve their purpose.
Language is purposeful behavior, for survival and
growth. Communication is not empty chatter, random noises or meaningless
marks. Scholars identify three main purposes: exposition, persuasion,
and expression. These ultimate purposes have great impact on
writing.
Exposition is usually topic-centered;
persuasion is audience-centered; expression is writer-centered.
Exposition is concerned with information-transfer
in which clarity, simplicity, and fixed denotative words are very
desirable.
Persuasion, unlike exposition, often seeks ambiguity,
multiplicity, and suggestiveness in words to encourage audiences
to co-create, to add their own meanings and feelings, to infer.
Persuasion is primarily concerned with manipulating
the audience's feelings, unlike expressive literature (poetry and
fiction) in which the writers may be primarily concerned with exhibiting
their own personal feelings.
Unlike poets, novelists, and some essayists, who
sometimes disregard their audience's needs, persuaders are primarily
concerned with the audience's needs, and with results.
Persuasion is judged by effectiveness: does
it work? Does it persuade?
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In expository writing, the purpose is primarily
to transfer information, clearly, coherently, and cogently.
Thus, a memo or a well written list can be "good"
writing. In contrast, a poorly-written list might err in sequence
or proportion, or contain unrelated trivia.
But, in addition to basic information-transfer,
much of our expository writing follows social conventions appropriate
to the situation.
Expressive literature (e.g. poetry, fiction) has
different goals, is often more complex and subtle, and is endlessly
debatable.
Instructors sometimes ask also for personal narratives,
or informal essays, expressing your feelings or opinions. Such
subjective essays are useful ways of loosening up, or getting
over writer's block, or even helping self-discovery.
But, in most expository writing, the focus is
on the topic, not on the writer's self.
Purpose also determines the writer's role. In
expository writing, the writer is a reporter, a recorder, or a
teacher (how to do it).
In persuasion, the writer is a persuader, a peddler,
or a preacher (what should be done).
In expressive writing, the writer is a delighter,
an entertainer, or a storyteller. (When the poet is didactic,
then it's persuasion -- with frills.)
As a writer, ask yourself: What is the
purpose of this writing? To inform? To persuade? To entertain?
What effect do you want to have on the audience? To increase their
knowledge, their understanding? To move them to do something or
to believe something? To change them? To entertain them?
Problems commonly occur when we have multiple
and mixed goals. It helps to sort out our goals, list them, and
set priorities.
If you aren't sure about the purpose of a writing
assignment, ask the person who assigned it.
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