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As we mentioned before, the definition of trust according to social psychology
includes expectations for the party's ability to accomplish it, expectations for the
willingness to perform the responsibility of the party, and meta-communications for
trust to state the party. Among these definitions, the ability and the motivation can
be captured as a statistical index, however, meta-communication is more human
oriented.
The most basic meta-communication for trust is to say “I will trust you” from the
person who is trusting to the person who is trusted. Such an assertion makes a
commitment to the party. And the party carries the social responsibility when he or
she responds by saying “All right” (Fig. 5.5 ).
5.6.1 Areas Suitable for Our Approach
The evaluation of the evaluator is also an important thing because without it the
result of the evaluation of trust can not be validated. A responsible evaluation is a
costly job for the evaluator. The most important prerequisite for its adoption is the
existence of fair motivation on behalf of the evaluator. The proposed trust-rating
model has limited application (Fig. 5.6 ).
5.6.2 Our Meta-Communication Protocol for Trust
It is important that parties who commence trusting each other confirm it explicitly.
Some form of meta-communication, like saying, “I will trust you” and responding
“All right, is required.” In the real world, not only legal contracts, but also various
kinds of social ceremonies, like a declaration of marriage, require a strong mental
commitment from the parties and their explicit statement of trust. In our social
model, when a subject wants to trust some object with which they share a weak tie
of social relationship, explicit meta-communication is required. In our meta-
communication protocol, the subject of trust sends a meta-communication message
to the object of trust before they begin actual communication. We also assume that
the subject is a state machine that changes its states with the events of this protocol.
5.6.3 The Mental States of the Subject and the Reputation
of the Object of Trust
After meta-communication is complete, a subject of trust forms his/her mental model
about trust for the object. When the state of the subject becomes “trustworthy” the
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