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How to Apply the Three Acid Tests of Persuasive Writing? by Philip Yaffe


"If you don't know what you are looking for, you are unlikely to find it, even if it's right in front of your nose." -- Anon

We all write in hopes that our readers will understand what we are saying with minimum effort and maximum pleasure. But how can we be certain that they will? We can't. However we can greatly improve the odds by abandoning subjective ideas of what constitutes persuasive writing and replacing them with quasi-objective criteria. During my 40-year career, I have relied on three such criteria, or "acid tests", that have served me very well. Not just for writing myself, but equally for evaluating the writing of others.

Many people don't actually do much writing themselves, but frequently may have to critique the writing of others. It is of very little use to tell someone that a text isn't "good enough", "interesting enough", or "just doesn't feel right". So work on it. Such fuzzy criticism is not only unhelpful; it can be positively demoralizing.

I am reminded of the story of a junior executive who presented a document he had written to his superior. He was told, "Make it more interesting". Being conscientious (and somewhat fearless), he replied: "Sir, this is the best text I know how to write based on the information I have. Unless you tell me exactly what you are looking for, any way l change it will only make it worse." Fortunately, the man's superior recognized the wisdom of the comment. In other words, in order to critique usefully, it is necessary to be explicit. This is exactly what my three criteria allow you to do.

Actually, it is incorrect to call them "criteria", because they are more than that. They are fundamental principles in the form of formulas that provide step-by-step instructions for producing recognizably well written texts, whatever the format or subject.

If you are the originator, they tell you:
1) How to write your text in the first place
2) How properly to edit it when you have finished

If you are the critic, they tell you:
1) What the text should contain
2) What needs to be done to improve it

Before looking at them in detail, let's first agree what we mean by a well written text. For most people, it has at least two principal characteristics; it must be both "clear" and "concise". Unfortunately, both of these are "weasel words". They mean different things to different people, as well as different things at different times. This is why we need quasi-objective test, to be certain that these words will mean essentially the same thing to all people all the time.

There is a third aspect of a well written text called "density", for which we also have a quasi-test.

Test for Clarity

According to the Clarity Principle, to be clear a text must do three things:

1. Emphasize what is of key importance.
2. De-emphasize what is of secondary importance.
3. Eliminate what is of no importance.

In short: Cl = EDE

If you follow the formula, when you evaluate a text (yours or someone else's), the first thing you should look for is: Do the key ideas fully stand out?
Key ideas are the concepts and conclusions the writer wants the readers to take away from text. Too many writers shy away from the hard work of defining the key ideas. It is far simpler to say that everything is of key importance, so they put in everything they have. However, unless the writer does the job of defining what he really wants the readers to know, they won't do it for him. They will simply get lost in your text and either give up or come out the other end not knowing what they have read.

Second, check that the text de-emphasizes everything that is of secondary importance. Why? Because if you want readers to recognize and retain the key ideas, then you don’t want them getting lost in the details. Details (information of secondary importance) explain and support the key ideas; they must never overwhelm them. Finally, you must ruthlessly eliminate everything of no importance. These are bits of information that are neither a key idea nor explain or support a key idea. Nothing in is neutral. Whatever doesn't add to the text, subtracts from it. And so must be deleted.

Test for Conciseness

According to the Conciseness Principle, a well written text should be as:

1. Long as necessary
2. Short as possible

In symbols: Co = LS

"As long as necessary" means covering all the key ideas you identified under “clarity”, and all the information of secondary importance needed to explain and support them. Note that nothing is said here about the number of words, because it is irrelevant. If it takes 500 words to be "as long as necessary", then 500 words must be used. If it takes 1500 words, then this is all right, too.

"As short as possible" means staying as close as you can to the minimum. Not because people prefer short texts. "Long" and "short" are weasel words; in the abstract they have no meaning because what is "long" in one circumstance is "short" in another.

The important point is:
All words beyond the minimum tend to damage clarity. Subconsciously, readers will continually be trying to understand why those words are there. And will be continually failing because they serve no purpose.

Test for Density

"Density" is a less familiar concept than clarity and conciseness, but it is equally important. According to the density principle, a text should contain:

1. Precise information
2. Logically linked

In other words: D = PL

Using precise information rather than wishy-washy weasel words aids clarity. For example, if you say it is a “hot” day, what do you mean? One reader might interpret hot as 24° C while another might interpret is as 36° C. However, if you say the temperature outside is 28° C, there is no room for interpretation -- or misinterpretation.

Using precise information also generates confidence, because it tells the reader that the writer really know what he is talking about. This helps to hold the reader’s attention and makes it easier to get key points across. However, precise data (facts) by themselves are insufficient. To be meaningful, data must be organized to create “information”.

There are two important tests to apply when converting data into information.

A. Relevance Is a particular piece of data really needed? As we have seen, unnecessary data damages clarity and ultimately confidence. Therefore, any data that do not either aid understanding or promote confidence should be rigorously deleted.

B. Misconceptions
The logical link between data must be made explicit to prevent readers from coming to false conclusions. Example: A singular occurrence may be misinterpreted as part of a broad pattern; a general policy may be misinterpreted as applying only in specific circumstances, etc.

To ensure that a logical link is clear, the two pieces of data should be placed as close to each other as possible, preferably right next to each other. When data are widely separated, their logical link is masked. If the writer doesn't make the logical connection, it is unrealistic to expect readers will do so for themselves.

So there they are -- three fundamental "acid tests" for clear, concise, dense writing. Although quasi-objective, these tsts are not a panacea. They require you to think; in fact, they force you to think. And that is their strength, because they guide your thinking to precisely what you should be thinking about.

To repeat the adage at the beginning of this article:
"If you don't know what you are looking for, you are unlikely to find it, even if it's right in front of your nose." Now you know.

Contributing Writer  Philip Yaffe is a former reporter/feature writer with The Wall Street Journal and a marketing communication consultant. He currently teaches a course in good writing and good speaking in Brussels, Belgium. His recently published book In the “I” of the Storm: the Simple Secrets of Writing & Speaking (Almost) like a Professional is available from Story Publishers in Ghent, Belgium ( and Amazon ( For further information, contact: Philip Yaffe, Brussels, Belgium Email: [email protected]


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