In "The Rules of Sociological Method" (1895), Durkheim expressed his will to establish a method that would guarantee sociology's truly scientific character. One of the questions raised concerns the objectivity of the sociologist: how may one study an object that, from the very beginning, conditions and relates to the observer? According to Durkheim, observation must be as impartial and impersonal as possible, even though a "perfectly objective observation" in this sense may never be attained. A social fact must always be studied according to its relation with other social facts, never according to the individual who studies it. Sociology should therefore privilege comparison rather than the study of singular independent facts.