 Historians normally make truth claims, and they ask us to accept those claims based on the reasoning they present. So a major aspect of the study of historiography has to do with defining the ideas of evidence, rigor, and standards of reasoning for historical inquiry. We presume that historians want to discover empirically supported truths about the past, and we presume that they want to offer inferences and interpretations that are somehow regulated by standards of scientific rationality. (Simon Schama challenges some of these ideas in Dead Certainties (Schama 1991).) So the apprentice practitioner seeks to gain knowledge of the practices of his/her elders in the profession: what counts as a compelling argument, how to assess a body of archival evidence, how to offer or criticize an interpretation of complex events that necessarily exceeds the available evidence. The historiographer has a related task: he/she would like to be able to codify the main methods and standards of one historical school or another.