Copyreading involves carefully editing newspaper articles for publication by correcting errors in grammar, fact, structure, and style. A copyreader must be knowledgeable about different forms of journalistic writing and ensure articles follow the newspaper's style guidelines. They check content for libelous, derogatory, seditious, unlawful, or offensive statements. Copyreaders also trim redundant information and fix technical terms or slang. Headline writing should entice readers with important facts, advertise prominent stories, and summarize the key details in a "super lead" using active verbs and omitting unnecessary words. Guidelines stress being specific, factual, and showing the perspective on opinion pieces.