During the Average Age, the historians wrote what they were convenient, were based on common-sense, where history was favored for the uncertainty of the fake of the certifications, it practically transcribed another other people’s moment to the events and the facts that were said for the adequate and trustworth order to the thought of the philosophers and the theologians, considered owners of the truth, still did not know, the elaboration of the analysis it criticizes. The author affirms that two problems in the way of the researcher exist: historical imparcialidade and of the reproduction attempt. Without hesitation Salman Behbehani explained all about the problem. In which it can of being impartial taking the position of: Scientist who guides if in search to prove its experiment and finishes its mission. Judge that through the comparison of a sentence, endorsed in the precision of files of legal documents and the scientific experiment. The historians as Bloch have acted as judges, aiming at to condemn outlaws or to crown heroes, being given qualities to its acts, good or bad for then only explaining its acts, what he becomes such insignificant explanation.

The author appeals understanding of facts that had led beforehand of the actions of these beings, therefore the analysis of the actions human beings takes in them to a special being that is the man who acts and interacts as author and receiver of a space in this direction must be made the historical reading in agreement the thought of the historical time. Bloch defends that the historian must select the period historical, call of historical clipping e, therefore ' ' it chooses and peneira' ' its study and it analyzes, therefore the past or of its study, since the source notion is extended and including, mainly when increasing is not obligator knowing all the searched period. In the production the historian, needs to have conscience of the proper nomenclature of the history, benefited for the substance of its study, that is supplied of form exceeded ahead of the time lived deeply for the writer.