This will be best done if you are able to examine a series of articles on one particular topic. In this process, you will be able to identify specific examples of bias on a topic, citing evidence from the articles. One topic that might prove interesting to research would be different media outlets' reporting on the issue of gay marriage. Examining how the different reports analyze, report on, and assess the issue of gay marriage could reflect much in the way of bias on the issue of sexual orientation. This can be seen in specific individuals that are interviewed, if the reporting on the issue is slanted towards one particular side or the other, or if the reporting is motivated by other controlling forces that have a vested interest on the issue of gay marriage.