Information Technology Reference
In-Depth Information
Belief Source
- Source's trusfulness in the trustor's view
- Certainty about the source
- Source's subjective certainty about the belief
............
Single Belief
(value of the content)
Figure 11.1
From single beliefs to the belief source
Those beliefs are not all at the same level. Clearly some of them are meta-beliefs, and some
of them tune, modulate the value and the impact of the lower beliefs. The general schema
could be described as a cascade having two levels (see Figure 11.1); at the bottom level there is
the single belief (in particular, the value of the content of that specific belief; this value should
be used (have a part) in the trustor's evaluation of some trustee's feature); at the top level there
is the composition of the previous value with the epistemic evaluations of the trustor. At this
level all the contributions of the various sources of the same type are integrated.
Let us consider as an example the belief source of the kind ' Reputation ' about a doctor's
ability (see Figure 11.2). In order to have a value, we have to consider many opinions about
Reputation about Ability
- John normally says the truth
- I am sure that John says it
- John is sure of his opinion
............
Selftrust
John's Selftrust
Trust on John
(as info source)
............
John's Belief
Figure 11.2
Case of belief source of Reputation
 
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