Ethos is used to convey the writer’s credibility and authority. When evaluating a piece of writing, the reader must know if the writer is qualified to comment on this issue. The writer can communicate their authority by using credible sources; choosing appropriate language; demonstrating that they have fairly examined the issue (by considering the counterargument); introducing their own professional, academic or authorial credentials; introducing their own personal experience with the issue; and using correct grammar and syntax.