The publication of Section IX signifies the completion of the Critical Edition of Friedrich Nietzsche's Complete Works. The texts Nietzsche wrote into his notebooks and exercise books from 1885 to 1889, are now to be published in their entirety, including other notes from his last creative period found in older notebooks or notes now collected in folders. For the first time a complete and edited documentation of Nietzsche's unpublished material will be presented in a manner which preserves its typical notelike character. The publication of the manuscripts from 1885 to 1889 will provide Nietzsche scholars with a reliable and transparent basis for interpretation, and the connectivities in the author's thought, writing and works will become visible. As did volumes 1-3, volume 4 and 5 contain a CD-ROM, which provides the representations of the unpublished manuscript facsimiles.