 Groups often need to reach decisions and decisions can be complex, involving the assessment of several related issues. For example, in a university a hiring committee typically decides on a candidate on the basis of her teaching and research qualities. A city council confronted with the decision of building a bridge, may ask its members to state whether they are favorable or not and, at the same time, to provide reasons for their position (like economical and environmental impacts, or expenditure considerations). Lastly, jurors are required to decide on the liability of a defendant by expressing their judgments on the conditions prescribed by the relevant code of law for the case at hand. As pointed out by Kornhauser and Sager (1986) referring to real jury trials, the aggregation of individual opinions on logically interrelated propositions can lead to a paradoxical result, the so-called doctrinal paradox. Inspired by the doctrinal paradox in jurisprudence, the problem of judgment aggregation attracted the interest of political scientists, philosophers, logicians, economists and computer scientists. Links to social choice theory have shown that, similar to the problem of preference aggregation (Arrow 1951/1963; Sen 1970), a judgment aggregation procedure that satisfies a number of desirable properties does not exist.