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Desirable tie-braking rules in collective decision-making

A panel of experts is a group of people selected and assembled for some service such as investigation, arbitration, generation of guidelines etc. We consider a panel of experts which has to form a collective view in favor or against a certain issue. The panel is required to provide adequate reasons to support their view, as well as make explicit what the connection rule between the reasons and the issue is. We assume that every member has to propose a decision rule and corresponding relevant reasons. For example, for an issue i and a decision rule (r1 ∧ r2) ↔ i, r1 and r2 are referred to as relevant reasons. Hence, the agenda is constituted by the following items: the original issue which the panel needs to decide on, the decision rules that each member proposed and all the corresponding relevant reasons. The outcome of the panel deliberation consists of a collective decision on the issue together with a unique decision rule and corresponding relevant reasons.