Authority- Does the source have an author or sponsoring organization that is qualified and knowledgeable about the topic you are researching?
Accuracy- Is the information on the site correct? You may need to have a second source to fact check against if you are not sure.
Currency- When was the source published? If you are using a website look for the date it was last updated. Different fields and topics have different standards of acceptable date ranges.
Objectivity- Is the Information on the site biased? Look for ads, editorial writings, or other indications that the source is meant to sway the audience to a particular point of view.
Coverage- How comprehensive is the source? Some projects benefit from sources that offer a general overview. Others will require a more in-depth analysis of a narrow topic. Be sure you know what will be best suited to your project.