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A serious problem on the WWW is finding reliable information. Not everything found on the Web is true and the semantic Web does not change that in any way. The problem will be even more crucial for the semantic Web, where agents will be integrating and using information from multiple sources. Statements published on the semantic Web have to be seen as claims rather than as facts, and there should be a way to decide which among many possibly inconsistent sources is most reliable. In this work, we propose a trust model for the semantic Web. The proposed model is inspired by the use trust in human society. Trust is a type of social knowledge and encodes evaluations about which agents can be taken as reliable sources of information or services. Our proposed model allows agents to decide which among different sources of information to trust and thus act rationally on the semantic Web.