Towards argumentation-based decision making: a possibilistic logic approach

Argumentation-based decision provides a way for explaining choices which are already made, and for evaluating potential choices in terms of arguments. Each potential choice has pros and cons of various strengths, which are computed in the framework of possibilistic logic. Depending on the pessimistic, or optimistic nature of the decision-maker's attitude, arguments in favour of or against a possible choice have slightly different structures. When the available, maybe uncertain, knowledge is consistent, as well as the set of prioritized goals (which have to be fulfilled as far as possible), the method for evaluating decisions on the basis of arguments agrees with the possibility theory-based approach to decision-making under uncertainty. The proposed framework can be generalized in case of partially inconsistent knowledge or goals.