Documentary scripts tend to evolve over the course of production. In the case of programs that are significantly driven by narration, the script might begin to take shape during pre-production, only to be significantly revised and rewritten during editing. On programs in which narration augments visual storytelling, scripts are not usually written until editing or shooting is complete (or nearly complete). At that point, filmmakers will assemble a paper script. This script builds on the original treatment but takes into account changes to the story as filmed, and it incorporates interview, sync, and archival material in proposed screen order as a blueprint for the editor to follow. As editing progresses, this script is revised and rewritten, until no more changes are made. Not all films are edited this way. (Curran Bernard 2004, p.122)
