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Casuistry takes a relentlessly practical approach to morality. Rather than using theories as starting points, casuistry begins with an examination of cases. By drawing parallels between paradigms, so-called "pure cases", and the case at hand, a casuist tries to determine a moral response appropriate to a particular case.
Casuistry has been described as "theory modest" (Arras, see below). One of the strengths of casuistry is that it does not begin with, nor does it overemphasize, theoretical issues. Casuistry does not require practitioners to agree about ethical theories or evaluations before making policy. Instead, they can agree that certain paradigms should be treated in certain ways, and then agree on the similarities, the so-called warrants between a paradigm and the case at hand.
Since most people, and most cultures, substantially agree about most pure ethical situations, casuistry often creates ethical arguments that can persuade people of different ethnic, religious and philosophical beliefs to treat particular cases in the same ways. For this reason, casuistry is widely considered to be the basis for the English common law and its derivatives.
Casuistry is prone to abuses wherever the analogies between cases are false.