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To evaluate a source you must read and think about it. Questions to ask yourself about a source are listed below.
How old is the source? Can you find the date the information was created?
How important is currency for your research topic?
If the source is a webpage, are there any broken links on the page? If so, that might mean the page is no longer maintained.
Relevancy or Usefulness
Does the information you find have anything to do with your topic?
What are you trying to accomplish with the information you find? For example, are you writing a research paper, looking for a quick fact or deciding which classes to take? Does the information you find help you do that?
Why or why not?