Creibility is the objective and subjective components of the believability of a source or message. Traditionally, credibility is composed of two primary dimensions: trustworthiness and expertise, which have both objective and subjective components. That is, trustworthiness is a receiver judgment based on subjective factors. Expertise can be similarly subjectively perceived but includes relatively objective characteristics of the source or message as well (e.g., source credentials or information quality). Some secondary dimensions include source dynamism (charisma) and physical attractiveness, for example.