Qualitative possibility theory in information processing

This chapter provides a general overview of advances made in qualitative possibility theory and its application to information processing in the last decade. These methodological results reflect a series of works done in few research groups, including the one of the authors. More precisely, the ability of possibility theory to handle positive and negative information (knowledge as well as preferences) in a bipolar way is emphasized including an original revision process, together with its use for representing information in different formats, for formalizing various types of reasoning pervaded with uncertainty, for providing a qualitative framework for decision making, and for learning from imperfect data.