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Not all of the material you uncover during your research process with be useful for your particular project. It is important to evaluate the credibility of any source before you rely on the information for your own projects. When evaluating print materials, you will first want to determine what type of publication is it - is it a scholarly or popular type of publication?
Second, you should determine the bias of the publication. Figure out for whom the article was intended and determine if it is a balanced treatment. If it is not a balanced source, does it support the angle you wish to pursue? It is also a good idea to check the credibility and reputation of the author and the publisher.
Finally, you will want to make sure that your information is relevant to your research, particularly is you are examining an older source. The University of North Carolina at Pembroke provides some thought-provoking questions that will help you evaluate your sources. Web pages in particular can be tricky to evaluate since anyone can publish anything they want on the Web. The UC Berkeley Library has a superb tutorial including important questions to ask yourself when evaluating web pages.
Some other useful sites include:
Critically Analyzing Information Sources
This web site was developed by the librarians at Cornell University and is a good starting place to learn about the types of questions you should be asking concerning the appropriateness of resources you may find while conducting research in the literature.
Evaluating Web Resources
Developed by the librarians at Widener University this web page highlights those features that you want to look out for in a web page that will help you determine whether or not it is a good site.
Evaluating Information Found on the Internet
An excellent web site developed at Johns Hopkins University.
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