Communities of Practice (CoPs) are places in which the flow of knowledge is generated as a result of the confidence that members have in each other. The main goal of this research is to emulate these communities’ behavior in knowledge management systems. As a consequence of this, an increase in the exchange information between the members of a virtual community is expected. However, upon starting this work, we encountered several problems. For instance, how could we implement or rate social aspects such as trust and reputation?. This paper describes our advances in resolving these problems.