When was the resource published? Older material is suitable for establishing a historical context but not for information on current issues.
Website Specific
When was the site last updated and by whom? Avoid using undated websites.
Authority
Who is the author or editor? Are their qualifications, experience, institutional affiliation and other publications listed?
Can the author be contacted for clarification?
Website Specific
Who created the website? Are adequate contact details and/or provenance available for the creator? An email address is not sufficient.
Purpose
Is the purpose of the writing clearly stated? Is it technical or clinical? Choose sources relevant to your needs e.g. if searching in the medical field for statistics avoid resources aimed at clinical practitioners;
Who is the intended audience? At what academic level is the material pitched?