Nowadays, the increase in information and in sources from which to obtain knowledge have generated a large-scale development of knowledge sharing systems. However, these systems do not always live up to the expectations of the organisations that use them, as they do not take the fundamental social aspects necessary for the flow and sharing of knowledge between the members of a community into consideration. The objective of our work is to emulate the behaviour of communities of practice, where the confidence that exists between the members of these communities leads to an exchange of knowledge. We have, therefore, designed a three-level multi-agent architecture which takes into account both the way in which a community member behaves and the community to which that member belongs.