What is credibility?
Simply put, it can be defined as believability, while scholars agree it is a perceived quality.
Perceived credibility ＝ Perceived trustworthiness + Perceived expertise
 Trustworthiness= fair and unbiased, truthful
Fair and unbiased, sources argue against their own interest, perceived similarity leads to trustworthiness
 Expertise= knowledge, experience, competence
 The most credible source= high level of trustworthiness + high level of expertise
When one dimension is strong, and the other one remains unknown, the computer product maybe perceived as credible; when one dimension is known to be weak, regardless the other dimension, credibility suffers.
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