Is the document well written and free of errors? Are facts and statistical data verifiable?
What are the credentials of the author? What is the domain of the document? (Such as, .com, .gov, .org, or .edu)
What are the goals of this document? Are there any advertisements? Is the advertiser/sponsor likely to have bias?
When was the page created? How often is the site updated? Are there any broken links?
Is the content factual or opinion? Has the information been cited correctly?
Source: Cornell University Library, Five Criteria for Evaluating Web Pages