As a researcher you will navigate a vast amount of information from a variety of sources, including but not limited to books, journals, and the Internet. Not everything you find is appropriate to use in your research paper. Because as a researcher you should aspire to become an expert on the topic of your choice, you need to consider whether the information you are finding is reliable, valid, authoritative, relevant, and current.
Looking for information on the web appears easy, but you should never assume the sources you find are reliable. The Internet Detective tutorial will teach you how to wise up to the web.
To learn about evaluating information posted on blogs and wikis, social networking sites, and other kinds of new media sites, follow the guide prepared by University Libraries at SUNY Albany.
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Currency: The timeliness of the information.
Relevance: The importance of the information for your needs.
Authority: The source of the information.
Accuracy: The reliability, truthfulness, and correctness of the informational content.
Purpose: The reason the information exists.
The above list is not static or complete. Different criteria will be more or less important depending on your situation or need.
Watch a segment from Stephen Colbert's show to understand why your professors discourage your from using Wikipedia for your research asignments.