 As in preference aggregation, the cost of relaxing independence is the loss of strategy-proofness. The conjunction of independence and monotonicity is necessary and sufficient for the non-manipulability of a judgment aggregation rule by strategic voting (Dietrich and List 2007c; for related results, see Nehring and Puppe 2002 [Other Internet Resources]). Thus we cannot generally achieve strategy-proofness without relaxing either universal domain, or collective rationality, or unanimity preservation, or non-dictatorship. In practice, we must therefore look for ways of rendering opportunities for strategic manipulation less of a threat.