A general collective decision problem is analysed. It consists in many issues that are interconnected in two ways: by mutual constraints and by connections of relevance. The goal is to decide on the issues by respecting the mutual constraints and by aggregating in accordance with an...

A population''s level of terrorism depends on two factors: people''s preferences (would they like creating damage?) and the constraints under which people act (what damage could they create, and at what punishment?). Cause-related policies, e.g. improving social stability or education, aim at...

Condorcet''s famous jury theorem reaches an optimistic conclusion on the correctness of majority decisions, based on two controversial premises about voters: they are competent and vote independently, in a technical sense. I carefully analyse these premises and show that: (i) whether a premise...