http://popups.lib.uliege.be/1373-5411/index.php?id=1379 Index terms fr 0 http://popups.lib.uliege.be/1373-5411/index.php?id=1377 Representation and manipulation of the world by models. Using world models for reasoning and action purposes. Two types of reasoning forms : symbolic and subsymbolic. Classification of subsymbolic reasoning forms by attributes of communicability enumerability and robustness. Roles of system observers realised with different subsymbolic technologies. Introductio of circular qualitative algebra(CQA) with its attributes of precision, robustness, learning ability, usability and interpretability. Application of CQA to : pattern recognition, modeling of power plant combustion process and traffic accident modeling. Thu, 11 Jul 2024 15:55:21 +0200 Thu, 11 Jul 2024 15:55:32 +0200 http://popups.lib.uliege.be/1373-5411/index.php?id=1377