Comunicazione E Livello Di Fiducia in Dali, Un Linguaggio Logico Orientato Agli Agenti Communication and Trust in Dali, an Agent-oriented Logic Programming Language1

valutazione dell'interlocutore come ad esempio la fiducia, intesa come forma di conoscenza sociale basata su vari fat-tori, fra cui le interazioni avvenute nel passato. In questo lavoro mostriamo come sia possibile modellare il concetto di " livello di fiducia " ed i cambiamenti che esso subisce nel tempo mediante l'architettura di comunicazione del lin-guaggio logico orientato agli agenti DALI, e proponiamo un esempio volto a mostrare l'efficacia dell'approccio. Interaction is an important aspect of Multi-agent systems: agents exchange messages, assertions, queries, etc. This, depending on the application context, can be either in order to improve their knowledge or to reach their goals or to organize useful cooperation and coordination strategies. In real-world applications, communication should be based on some form of evaluation of the other party such as for instance trust, understood as a form of social knowledge based on various factors, among which past interactions. In this paper we demonstrate how to model the " level of trust " and its possible evolution in time by means of the communication architecture of the DALI agent-oriented logic programming language. We also propose an example aimed at showing the effectiveness of the approach. * We acknowledge support by the Information Society Technologies programme of the European Commission, Future and Emerging Technologies under the IST-2001-37004 WASP project.