Problems to Look For 2. Sample Evaluation Tools 3. Goals-based Evaluation 1. I never guess. If this information is not provided and the information is worthy of further investigation, you can look for contact information on the author and use e-mail to seek these dates directly from the author.
Credibility refers more to the origins of the information.
There should be information about the author or links to a web page that presents his or her credentials. Along with these credentials should be links to other documents that have been published by the author. This should be examined as well for consistency. Also look for information about the publisher, the organization that is making the information available. This might be a university, research center, government agency, or a corporation.