In this study, the age-old distinction between decision method and criterion of rightness, commonly employed in normative ethics, was used to attain a detailed understanding of inter- and intrapersonal variety in students' moral reasoning. A total of 24 Swedish students, 12–15 years of age, were interviewed. Inter- and intrapersonal varieties in and between the two dimensions of moral reasoning were found, constituting six novel forms of varieties. We describe several explanations proposed within the field of social-cognitive domain theory, and argue (...) that these do not suffice to explain all the found forms of varieties in students' moral reasoning. Some limitations of the present study are discussed, and some suggestions for future research are given. (shrink)