The IMSA Evaluation Wizard provides many questions to guide your analysis.  In general you will want to check for information on the author, the publisher, and alternative opinions.  It is important to know who's information you are using and why they believe as they do.  Will you use the country western singer's web page on cancer or the one by the American Cancer Society? Why?

Triangulation of data is most important.  Always have at least three reliable sources that agree on an important point.  If you use three different sources to write a report about our solar system, and they all give a different distance between the earth and the sun (some estimating, some rounding, etc.), then which figure will you use on the exam next week?

Finally, double-check language.  If you don't recognize a word or a web page is using unfamiliar technical terminology, look it up in an online dictionary and/or encyclopedia.  Make sure the author isn't fabricating myths.  Many a professional technical page has turned out to be nothing more than an elaborate hoax.  Anyone remember the scientists who proved they cloned a human baby?  New versions of reference books published in print for sale will not be available online.  Companies will try to earn money by selling hard copy books first.  Look for back issue books or newspapers and white papers if the topic is current.