Timeliness For some research the most current information is needed. Other research requires that a topic be followed through time using sources from years ago. Check publication date of the book in hand. Also review the publication dates of the works cited as references. A web page should give the date created or most recently updated.
Web pages are often short lived.
What you see one week may be revised or disappear the following week. Keep a record of the date you visit a site and include that date when you cite your sources. Thinking Critically about World Wide Web Resources . In addition, there are other web evaluation guides available on the Library's Internet Search Engines web page.