Criteria Explanation C6. Spelling Correctly used spelling is also of the utmost importance. Misspelled words cause a lot of reading problems, as they may, in some cases, mean something different than intended. Also, they may cause distractions as your readers try to figure out what you mean. To resolve this issue, follow the same procedure as with grammar by proofreading your text. If you are uncertain about a certain word's meaning or how it should be spelled, consult the online dictionary.