During 2003, there have been two projects conducting research in Computer Generated Forces and Human Behaviour modelling. Because of common interests and research activities the projects have had a close research relation with joint presentations and demonstrations. At the Division of Systems Modelling the focus has been on development of a joint library containing cognitive- and human behaviour models for various tasks and applications, while at the Division of Command and control Systems the focus has been on development of cognitive models for individual infantry warriors. Both projects have common interests in methods of task analysis, AI-algorithms (path-finding, formation,etc), utilization of data from experiments and case-studies. Verification and Validation and implementation of behaviour models for simulator systems. Both projects rely on their work to result in improved military simulation activities where many units need to participate. There is evidence of an increased demand for computer generated forces and human behaviour models for analysis and simulations within the M&S community, including a number of projects and applications at FOI. The research activities for this year, have been concentrated on studies and analysis of Performance Modifier Functions including prototype models used in simulations, design of a model library architecture, development of tools to aid in creation of behaviour models and to integrate them into existing and future simulation frameworks and development of a databas with physiological and psycho-physiological data to aid in development of human behaviour models of individual infantry warriors.