Readability Metrics: Are They Getting Your Message?

What is "readability" and why does it matter?a fog index of 12, it has the reading level of a U.S.
According to the encyclopedia, "Readability is ahigh school senior. The test was developed by
measure of the accessibility of a piece of writing,Robert Gunning, an American businessman, in
indicating how wide an audience it will reach.1952. Texts that are designed for a wide audience
Readability is a judgment of how easy a text isgenerally require a fog index of less than 12.
to understand." [Wikipedia 2006]Formula:
Why is it important? Well, of all the fuzzyThe Laesbarhedsindex (LIX) readability formula is
uncertainties about whether your marketinguseful because it's simple can be used on
message or website text is just right to do thedocuments of any Western European language.
job, one thing you can be certain of is whetherThe test calculates an index score of a text
your readers can understand it. Your copywritingsample based on sentence length and number of
ability may be good, bad, or indifferent, but youlong words (i.e., words containing seven or more
can be absolutely sure that if they can't read itcharacters). Formula: [
you don't have a chance.SMOG (Simple Measure Of Gobbledygook) is a
Tools of the Tradewidely-used readability formula that estimates the
While copywriting itself is as much art as science,years of education needed to understand a piece
fortunately readability metrics are easy toof writing. It yields an outstandingly high 0.985
calculate, simple to interpret, and tell no lies. Mostcorrelation with the grades of readers who had
of us don't use them but we should. This is the100% comprehension of test materials. G. Harry
bare minimum -- how many of your readers canMcLaughlin invented it in 1969 as a more accurate
"get" what you are writing. The tools toand more easily calculated substitute for the
determine this are readily accessible, free, andGunning-Fog_Index. Formula:
easy to use.What's Good?
Under Tools in Word, their spell check will calculateA "good" score, of course, depends on your
some summary counts and averages as well astarget audience, your chosen style (part of
two readability metrics if you tick off "Checkbranding), and what you mean to do. But there
Readability Statistics" in the Options for Spellingare some general rules of thumb. According to
and Grammar. But it does this last so you haveFuture Now [2006] referring to various published
to go through the whole spell check first. Maybestudies, an "ideal writing standard" might be as
that isn't such a bad idea, though...follows:
However, much more powerful is an excellent- No more than 4.25 characters per word.
free tool from Readability.info. This online resource- No more than 5% passive voice.
computes readability scores for Word files and- No less than an 80% readability.
whole Web sites in a flash. As they say: "By- A Flesch-Kincaid Grade Level between 4 and 65
comparing the readability score of different(sky's the limit, it seems...)
documents (or Web pages) you can better hone- A Fog Index higher than 13 puts you in the
your writing and make sure that you aren'tdanger zone.
creating overly complex sentences andWhile the Grade Level seems arbitrary depending
paragraphs for your audience."on who your target audience is, it should be said
Specifically, the tool provides all the followingthat the average best-seller is around Grade 4
readability and associated metrics:level, newspapers about 6, and business books
- Readability Indexes7-8. Lower than you might have thought.
- Sentence InformationOf course your audience can read at higher levels
- Word Usage Info-- but you want to make your message easy to
- Sentence Beginningsread. If your readability scores seem wildly out of
Another free tool that isn't nearly as powerful butline with your audience's abilities, Future Now
is certainly useful (and you probably haven't heardoffers a few strategies for making repairs:
of before) is Future Now's online We-We- Rewrite passive sentences so they become
Calculator. No, it isn't a urine test for illegal drugs!active sentences.
This nifty tool analyzes the words on your site to- Remove unnecessary words like "the" or "a",
see if you are talking mostly about yourextraneous words like "that", adjectives that don't
customers and their needs or if you talkingpack a meaningful punch or anything that isn't
mostly about yourself.helping your message.
We are rather proud of our businesses, products,- Replace 50-cent words with 5-cent words
and services. But naturally customers don't muchwhenever the difference isn't critical to your style
care about that (strange, isn't it?). Rather, theyor meaning.
are very interested in themselves and their own- Let your verbs do the work you'd otherwise
wants and needs. Future Now's quick analysis canassign your adjectives.
help you adjust that balance. You will probably be- Take the time to learn how your customers
surprised by the objective analysis.talk about your product or service so you can
Readability Scoreswrite to them in language they actually use.
This is a good time to review the various popularOnly One Piece of the Puzzle
readability indexes, all of which are calculated byObviously this is just a quick introduction to the
the Readability.info tool. Some take a differenttopic. But taking a closer look at your text
approach or measure things a bit differently and,content in a quantitative way may provide some
in any case, everyone selects just a fewsurprises as well as pointers to adjustments you
favorites that they rely on regularly. Here theymay wish to make. While there are sound
are:guidelines, in general, there is no "good" or "bad"
The Automated Readability Index (ARI) isscore -- it all depends on what you want to
designed to gauge the understandability of a text.achieve.
Like many of the other indexes, its output is anIf you are aiming at the widest possible audience
approximate representation of the U.S. grade levelthen the lowest reasonable grade level is what
needed to comprehend the text. Unlike the otheryou want. If it's a fairly serious discussion for a
indices, the ARI, along with the Coleman-Liau,B2B audience then maybe you don't want to
relies on a factor of characters per word, insteaddumb-down your content but prefer to aim at a
of the usual syllables per word. Formula:grade 8-10 comprehension level. It all depends.
The Coleman-Liau Index was designed to gaugeTerms like "Monetizing Behavioral Targeting" or
the understandability of a text. Like the ARI buteven more complex ones may not please the
unlike most of the other indexes, Coleman-Liaureadability programs but you know you have to
relies on characters instead of syllables per word.use them in certain circumstances. "Metrics" is an
Although opinion varies on its accuracy asawfully useful word, yet it isn't familiar to most
compared to the syllable/word and complex wordpeople at first. Sometimes you have to do what
indices, characters are more readily andyou gotta do -- don't throw the baby out with
accurately counted by computer programs thanthe bathwater.
are syllables. Formula:And, of course, these numbers aren't the only
The Flesch-Kincaid Readability Tests are designedcritical element in your copywriting: "Obviously,
to indicate how difficult a reading passage is tonumbers alone can't make you a good writer.
understand. There are two tests, the FleschMany other factors contribute to readable,
Reading Ease Index and the Flesch-Kincaid Gradecomprehensible writing." We might also add
Level Score. These are supposedly the same"effective" there.
measures, just placed into a different scale butThese factors include not only what good
the results of the two tests do not alwayscopywriters do, but also elements such as font,
correlate closely. Formula:size, color, placement, etc. in your presentation or
The Gunning-Fog Index is a test indicating thewebsite design. Even what day and time you send
number of years of formal education that aout an email marketing message. Lots of pieces
person requires in order to easily understand ato this puzzle and the more you know about each
text on the first reading. That is, if a passage hasthe better your chances of success!