The tendency of a source is its motivation for providing some kind of bias. Tendencies should be minimized or supplemented with opposite motivations.
* If it can be demonstrated that the witness or source has no direct interest in creating bias then the credibility of the message is increased.

Criteria of authenticity

Historians sometimes have to deal with deciding what is genuine and what is not in a source. For such circumstances, there are external and internal "criteria of authenticity"

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