We present the SSAHLA project, standing for Simulation based on Software Agents and the High Level Architecture. This project aims at designing a simulation environment for training scenarios, using software agents and the High Level Architecture (HLA). Software agents are considered due to their relevant features to simulation, such as autonomy, adaptability, and collaboration. The HLA is considered as a communication middleware between the participants who take part to the training sessions. Each participant is associated with different types of agents that work for him and thus, perform operations on his behalf. © 2002 Elsevier Science B.V. All rights reserved.