In the large body of work published under Nietzsche's name during his life and since his death it is necessary to make a distinction between his genuine 'works’ (i.e. those books published by him or prepared by him for publication) and all the remaining material (i.e. Nachlass [material left behind after his collapse and death], philologica, juvenilia): for the former group Nietzsche is responsible, for the latter he is not, since its distinguishing characteristic is that he did not offer it to the public as his ‘work’. Yet, mainly through the publication of The Will to Power—a compilation drawn from the Nachlass of the 1880s—the dividing line between these two groups has become blurred and the logical and orderly development of his philosophy obscured. If we are to attempt to trace that development we must first be clear where it is to be discovered—i.e. in the ‘works’. It would also be well to fix in advance the order in which Nietzsche's works appeared, since this is obviously of importance to any consideration of how his thought developed. For these reasons I give here a chronological list of Nietzsche's works as defined above. (The initials by which they are cited in the text are given on the right.)