The target grade level will depend on who your audience is, of course. The goal is to choose words that your readers are familiar with. The grade level readability score from a readability checker such as FORCAST is based on the average length of sentences and words.
There are quite a lot of different reading formulas, and they can vary a bit. Generally, they assume that longer words, harder words, and longer sentences make for harder reading.
Reading formulas can assess the clarity of texts for audiences around the world. Because most readability formulas are simple, they are relatively easy to use, which helps makes them reliable. They generally involve counting the syllables and words in a sentence.
The FORCAST was designed for the readability level analysis of technical documents such as forms, training manuals, or surveys.
Here is the FORCAST formula:
o Grade level (GL) = 20 − (N / 10)
The “N” in the formula is the Number of single-syllable words. The word sample is 150 words long.
The FORCAST Formula doesn’t rely on complete sentences – it uses only a vocabulary element. Also, it is not like a lot of the other formulas. Why? - Because a lot of the other formulas were designed for use in schools, but not the FORCAST. It isn’t able to calculate below a 5th-grade level.
In the 1970s, there was a trend of new readability formulas being created to determine the reading levels of texts. FORCAST was the result of this trend.
FORCAST was created from a study done by HumPRO. HumRRO was founded to conduct behavioral science research. It developed training methodologies, tools, and applications for use by the U.S. Army.
The Army needed to find a unique answer to help in improving their training documents. It was meant to help the new personnel who arrived in the Army. That’s why FORCAST was created, and it proved to be the perfect solution.
John Caylor, Thomas Sticht, and J. Patrick Ford were assigned to improve the training documents in 1973. Their research was on Vietnam draftees entering basic training. The FORCAST Readability Formula was created from their study. It was published in a journal called Literacy Discussion.
The FORCAST Readability Formula is considered ideal for multiple-choice quiz contests, entrance forms, applications, and more. The U.S. Air Force approved the FORCAST Readability Formula in 1977 because it was so easy to use.
FORCAST is a formula that was created to focus on functional literacy. Functional literacy is “the ability to identify, understand, interpret, create, communicate, and compute.”
If you are not writing for the public, then FORCAST runs slightly higher than the other reading formulas. If you’re a technical writer, then naturally there will be some essential terms that will need to be included.
For a FORCAST grade, it is recommended that writers aim for a grade of 9-10.
A FORCAST grade is used to indicate how difficult a text is to read. It is based on the number of "easy" words that have just one syllable in a sample of text containing 100-150 words. The values correspond to the number of years of education a reader needs to understand the text.
For example, a value of 6 would correspond to 6th graders of 11-12 years old. 12 would correspond to 12th grade.
It is important to note that FORCAST is not recommended to assess primary school reading text.
In 1973, a study was authorized by the U.S. military of the reading skills required for various military jobs. These reading skills were produced by the FORCAST formula. The FORCAST formula only uses a vocabulary element. This makes it handy for texts that don't have complete sentences.
The FORCAST formula was found satisfactory for reading material in the Army and easy enough for staff to use without requiring special training or equipment.
Today, the FORCAST formula is an asset to any technical writer. It has proven to be a very valuable tool for questionnaires because a good FORCAST score on a survey makes the text easier to read.
Here is a list of all readability tests.
Get insight into the reading age of political speeches. Find out which candidates use the lowest reading age, which ones alter the reading age based on where their speech is, and how political speeches have changed in recent times.