Credibility is the amount of trust that a resource, an argument, a piece of advice or a Web page engenders. It is the composite of the quality of research or observation and the reasoning or interpretation of the writer or speaker. The system that I will share incorporates and distills these criteria and helps to frame the critical thought process when encountering a new site without any obvious redeeming credentials. Since this is tax time of year, this system is named the I.R.S. audit: Identification, Reputation, and Sources.
Graham, Suzanne R., "Know Your Source : Assessing Credibility Online" (2009). Presentations. Paper 56.