Sourcing is about identifying and asking questions about the "credibility" of the source.
When sourcing, it's very important to identify and ask questions about the credibility. In other words, knowing the validity and reliability of the source ascertains the credibility of the source. Therefore, in order to know the credibility of a source, the individual carrying out the sourcing process must try to identify the truthfulness of that source and how its quality of being relied on.
An understanding of the source's credibility will enable the information to be adequate for the user.
