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Abstract
This presentation explores the use of default rules to reason in dierent contexts. Indeed, three factors may complicate reasoning: the temporal dimension (states of the world change over time), incomplete data (a lack of factual information), and a lack of understanding of the underlying generic (or even causal) laws. When faced with this uncertainty, an intelligent agent adapts its knowledge as new observations become available, or carries out a comprehensive retrospective review based on a complete sequence. To make decisions, the Bipolar Layered Framework uses default rules to express pros and cons arguments, with conclusions graded by their importance. By making the implicit defeasible knowledge and the uncertainties associated with it explicit, the aim of developing such automated systems is not only to ensure their veriability, but also to help people rene their understanding and critical thinking skills when faced with information.







