Correct spelling is important in effective communication. When a writer knows the correct sequence of letters needed to spell words, the message of a piece of writing is clearer. Because language requires a common understanding of words to build ideas, misspellings can interrupt the readers’ flow as they pause to determine what the writer meant to say. In some cases, the misspelling is confusing because it spells a real word. For instance, students who misspell two as too change the meaning from a number to a word indicating inclusion or degree.