The article discusses the conditions to which an action with two effects or double-effect, one good and the other evil, can be considered ethically permissible. It cites hypothetical cases describing the conditions which include that the action itself, its object is not intrinsically evil; the evil effect is not a means to the good effect; the evil effect is not intended as an end and there is a morally serious reason justifying allowing the evil effect.
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Christopher Kaczor, “Philosophy and Theology” Notes on Double Effect Reasoning, National Catholic Bioethics Quarterly 11.2 (Summer 2011): 381-386.