Historiography is the study of the way history is written. That is, its concern is not only the events of history but also the way in which historians have written about those events over time. As the document in the sources below states, historiography is a complicated study that regards the writing of history as subjective. The historian's bias or perspective affects the way in which he, she, or they interprets events, choose sources, and presents an account of history. When evaluating an historian's work, it is important to consider what biases or perspectives the historian is bringing to the work and what the historian's agenda might be. When a student of history is reading the work of an historian, these are important questions to keep in mind. An historian's account is never without bias or an individual perspective, and a student must consider how the historian chooses evidence (and what evidence is left out) in the account the historian presents.