The reading level is probably the best gauge for whether an average person will understand what you're saying. If it's reading level 14, that means post high sc

The reading level is probably the best gauge for whether an average person will understand what you're saying. If it's reading level 14, that means post high school. Most people in the US graduate from high school with an 8th or 9th grade reading level. So a piece with a 14th-grade reading level will be completely beyond them.