Spache Readability Formula
The Spache Readability Formula is a readability test for writing in English, designed by George Spache. It works best on texts that are for children up to fourth grade. For older children, the Dale-Chall Readability Formula is more appropriate.
It was introduced in 1952 in Spache's "A new readability formula for primary-grade reading materials," (The Elementary School Journal, 53, 410-413), and has subsequently been revised.
Calculation
The method compares words in a text to a set list of everyday words. The number of words per sentence and the percentage of unfamiliar words determine the reading age.
The original formula was:
The revised formula is:
Further reading
- Spache, G. (1953). "A New Readability Formula for Primary-Grade Reading Materials". The Elementary School Journal 53 (7): 410–413. doi:10.1086/458513. JSTOR 998915.
- Clarence R. Stone. "Measuring Difficulty of Primary Reading Material: A Constructive Criticism of Spache's Measure." The Elementary School Journal, Vol. 57, No. 1 (Oct., 1956), pp. 36-41