In this course manual, participants strengthen their understanding of the rules of fact-based journalism by reviewing common mistakes in the use of numerical or factual data. It is essential for both professional journalists as well as citizen journalists to understand these rules. Facts are the primary tool of information dissemination. If journalists and readers ignore facts and the rules governing their use from the outset, they will become accustomed to ignoring them in the long run. One of the bitter realities of the media is that many professional journalists often mislead their audience through mistaken understandings of numerical or factual data.