The knowledge is the main asset of current organizations in order to be competitive in the new global market. Wherefore, a current challenge of organizations is to adequately manage its knowledge. The organization knowledge mainly resides in the people that integrate the organization, who are generally spatial and timely distributed. In this work we present a distributed knowledge management system designed to support the management of tacit knowledge that belongs to people of an organization. This system is based on the use of mobile agents, which receive the user's queries and visit the organization domains where this information can be generated. So, the proper system has to analyze the queries to define the domains that offer greatest possibilities of answering them. To make this decision it has an intelligent agent (ISLA) with a knowledge base where the knowledge about information managed by each domain is represented. Firstly we present the agent-based analysis and design, and the defined architecture of the knowledge management system. Secondly, we describe the architecture of ISLA, the main agent of this system.