||Reasoning is the reasoned change of belief (and related mental states). Reasoning differs, for example, from daydreaming and from spontaneous changes of belief. A central issue in the study of reasoning is to characterize reasoning: Just what is it to reason as opposed to change one's beliefs in some other way? A second issue in the study of reasoning is normative. Some reasoning counts as good reasoning. Other counts as bad reasoning. Which forms of reasoning are good -- that is, are rational, or preserve justification or knowledge? What makes it the case that those kinds of reasoning are good? Reasoning is typically divided into two kinds -- deductive and inductive (or ampliative). In a good deductive inference, the premises of the reasoning logically entail the conclusion. In a good inductive inference, the premises of the reasoning do not entail the conclusion though they do support it. Part of the philosophical study of reasoning involves the study of these kinds of reasoning (and various further sub-kinds).