Abstract The doctrine of double effect (hereafter DDE) is so called because it is concerned with the moral permissibility of actions that have both a good effect and a bad effect. DDE is an important part of standard Catholic moral philosophy and also has been defended by some philosophers outside the Catholic tradition. It consists of criteria for the moral permissibility of actions that are typically morally wrong. Joseph Mangan's (1949: 43) statement of DDE is best known:
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