The test itself was the work of Rudolf Flesch. A writing and readability expert, Flesch was a key player in the Plain English Movement of the late '40s. He published many seminal books about the importance of plain language and clear writing. Flesch developed his readability formula in 1948.

Who developed readability formula?

Fry readability graph

In 1963, while teaching English teachers in Uganda, Edward Fry developed his Readability Graph. It became one of the most popular formulas and easiest to apply. The Fry Graph correlates 0.86 with comprehension as measured by reading tests.

Who is the pioneer of readability research?

Rudolf Flesch pioneered readability formulas

It was about adult reading material. This included a readability formula. A variety of investigators began to use it. A few years later, he published it.