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65,94
62,46
62,11
56,56
56,11
36,11
Figure 11.17
Experiment 9: monitoring (measuring the success rates). (Reproduced with kind permis-
sion of Springer Science+Business Media
C
2005)
introduces a little weight on controllability;
CONTROL 2
introduces a significant weight on
controllability;
STAT
is statistical.
Note that since the task resolution scheme is changed, these results are (on average) lower
than in the other experiments; however, it is possible as usual to compare the different strategies.
Considering controllability gives a significant advantage over the other strategies.
11.14.8 Results Discussion
In our experiments we have tried to compare different trust strategies to delegate tasks in a
contract net. The setting abstracts a simplified real-world interaction, where different agents
have different capabilities (mostly represented by ability) and use more or less similar re-
sources (mostly represented by willingness) in order to realize a certain task. The role of the
environment is also very relevant because external conditions can make the tasks more or less
easy to perform. On the basis of their trust, the delegating agents (with different strategies)
decide to whom to assign their tasks.
We analyzed two concepts of trust:
the first (referred to as the
statistical trustor
), that it is possible to model the trustworthiness
of other agents only on the basis of the direct (positive or negative) experience with them;
on the fact that there is only one dimension to consider: the number of successes or failures
the agents preformed in the previous experiences.
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