Reliability and credibility

What is the difference in reliability and credibility found on the Web and on University Library sites, such as UOP's?

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... placing a 25-pound weight on a scale and getting a different answer every time. What purpose would the scale serve? In fact, we most likely would question if indeed the scale is measuring weight or something entirely different. Unreliability would prohibit us from reporting our findings simply because they are not reliable? (http://www.alleydog.com/glossary/definition.cfm?term=Reliability)

Also see http://www.socialresearchmethods.net/kb/reliable.php.

CREDIBILITY

Credibility is defined in different ways, but the common words are believable and trustworthy. One definition is that credibility is "believability--A credible communicator is perceived as both expert and trustworthy?(http://highered.mcgraw-hill.com/sites/0072413875/student_view0/glossary.html). ...