In this paper we will show a possible implementation and advance of the socio-cognitive model of trust developed in previous works. This implementation uses a fuzzy approach (in particular, it uses the so-called Fuzzy Cognitive Maps - FCM). One of the aims of this paper is to show how relevant is a trust model based on beliefs and their credibility. In addition, given that the credibility of a belief directly depends from the credibility of its sources, we also analyse the different nature of the belief sources and their trustworthiness.
The richness of the referred model (trust is based on many different beliefs) allows to distinguish between internal and external attributions (to the trustee) and for each of these two attributions it allows to distinguish among several other sub-components such as: competence, disposition, unharmfulness and so on.
Another important aim of this paper is to show how the FCMs are really convenient and practicable for implementing and integrating the two mechanisms of the evaluation of trust (trustfulness) and of the decision to delegate.
