- sources behind the text, and
- scope and purpose.
So, how do you know if the Wikipedia entry you found or anything else on the web is true? Use the web with caution, verify facts and try to find cooberating evidence from articles or books by experts in the field. Keep in mind that just because it's in print doesn't mean it's true. My seventh grade English teacher quoted Benjamin Franklin who said, "Believe none of what you hear and half of what you see." (Should we believe him?)