Do the Read Naturally reading levels correspond to grade levels?
Our levels do correspond to the grade levels they are named for in that the readability score for each story in each level falls within about 0.3 of the grade level named.
However, that does not mean that stories in our 2.0 grade level are appropriate for all early second graders, for example. Rather, the 2.0 level is appropriate for students of any age whose instructional reading level is early second grade.
We used the following readability formulas to level our stories:
- Fry and Spache readability formulas for levels .8 through 2.7.
- Harris-Jacobson readability formulas for levels 3.0 through 5.0.
- Dale Chall readability formulas for levels 5.6 and above.