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There is no definitive way to calculate the quality of an information source. However, there are certain indicators that, in combination, can help you determine if the source you are considering is reputable. There are many evaluation methods you can use to assess an information source. Many of these methods apply to journals and journal articles, which will likely be the most common resource type referenced in your research.

Evaluation Method: Used to Assess:
CRAP test Any resource type
Peer review Journals


These evaluation methods must be applied with the caution of common sense; no evaluation method is failsafe and it would be imprudent to assess the quality of an information source using only one method. Using these theories in conjunction will enable you to form a rounded opinion on the quality and veracity of most information sources.