Their study found that the average reading level of the 107 instructions they
examined was the 10th grade, too difficult for 80 percent adult readers in the
U.S. When texts exceed the reading ability of readers, they usually stop reading.
The authors did not address the design, completeness, or the organization of the
instructions. They did not say that the instructions were badly written. Armed
with the SMOG readability formula, they found the instructions were written at
the wrong grade level. You can be sure the manufacturers of the car safety seats
are scrambling to re-write their instructions.
car safety seats