  Trust evaluation is an important topic in both research and applications in
sociable environments. This paper presents a model for trust evaluation between
agents by the combination of direct trust, indirect trust through neighbouring
links and the reputation of an agent in the environment (i.e. social network)
to provide the robust evaluation. Our approach is typology independent from
social network structures and in a decentralized manner without a central
controller, so it can be used in broad domains.
