How can you tell whether information you find on the web is accurate? The following criteria can help you with evaluating web resources.
Accuracy: The domain (i.e. .com) can tell you a lot about a website. Sites can be .com (commercial), .edu (academic institutions), .gov (governmental), .mil (military), or .org (organization - usually non-commercial). Of these, .edu and .gov sites are the most trustworthy.
Objectivity: Is the site subjective (opinion-based) or objective (fact-based)?
Timeliness: Hunt around for a "last updated" statement. If it's been more than a year or two since the last update, it can be a clue that the site is not maintained very well.
Authority: Can you find out who the author of the content is? If so, is s/he an expert on the subject? Does the author leave contact information?
Some sources for evidence-based information are available on the web.
Both PubMed and Cochrane Reviews (part of Cochrane Library) are also available through our UMass Amherst Libraries databases. Using these versions, you will have access to many more full text articles than through the public version.