January 2003
Beginner
312 pages
8h 49m
English
Content preview from Persuasive Technology
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Errors in Credibility Evaluations
In a perfect world, humans would never make errors in assessing credibility—
but they do. These mistakes fall into two categories: gullibility and incredulity
(Table 6.2).
Table 6.2 Errors in Credibility Evaluations
User perceives product
as credible
User perceives product
as not credible
Product is credible Appropriate
acceptance
Incredulity error
Product is not credible Gullibility error Appropriate rejection
If a body-fat measuring device reports that your body fat is 4%, it’s probably
not accurate unless you are a world-class athlete spending most of your time
training. If you accept the 4% figure as factual, you’re
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