Intentions in BDI Agents: From Theory to Implementation

In the context of the Belief Desire Intention (BDI) agent model and Bratman's theory, intentions play a primary role in reasoning towards actions. Indeed, intentions are supposed to be stable, constrain further deliberation, be conduct-control ling and influence belief's about the future. Thus, in this paper we present how PRACTIONIST, which is an integrated suite to develop BDI agent systems, embodies such properties of intentions. This allows to develop agents with the ability to know if desires are impossible, incompatible with other intentions and if intentions are achieved or no longer of interest. We first give an overview of the PRACTIONIST deliberation process. Then the implementation of such properties is shown throughout a running example, i.e. the PSTS (PRACTIONIST Stock Trading System), which is aimed to monitor investors stock portfolio by managing risk and profit and supporting decisions for on-line stock trading, on the basis of investors trading rules and their risk attitude.