Goal: Find a quality source, relevant for your information needs.
rel·e·vance (noun): the quality or state of being, closely connected or appropriate. (i.e., "this film has contemporary relevance")
Relevance considers the importance of the information for your research needs. A relevant information source answers your research question. To determine relevance, the purpose and bias must be understood. In fact, all aspects of evaluation must be taken into consideration to determine relevance.