Abstract: Argues that reasons require conceptual contents. That is to say, a person has a reason for believing something only if he is in some mental state or other with a representational content that is characterizable only in terms of concepts that the subject himself must possess and that is of a form that enables it to serve as a premiss or the conclusion of a deductive argument, or of an inference of some other kind (e.g. inductive or abductive).

Keywords: abduction, concept, conceptual content, deduction, induction, inference, reason, representational content,