The aim of this article is to establish a classification for the various written documents produced by assistant directors (before and during the rehearsals, during the run-throughs, from the first performance onwards and so on). It also underlines theatrical work as an autonomous subject of interest. These written documents are useful, and even indispensable according to certain directors. The notes may differ in nature at different times in the production process. In their finality they preserve a record of what is to be redone, a record of the work whose existence the audience does not suspect. Contrary to what one might believe, it is not always the actors who retain the truest memory of their work. The following is based partly on my own experience as assistant director, or intern, to Yves Beaunesne, Denis Marleau, Matthias Langhoff and Robert Wilson.