>>>>> "D" == David Carlisle <[log in to unmask]> writes: D> 2) To speed up processing of drafts as only the `current D> chapter' need be processed. It's perhaps fine in "drafts" to accept the presence of incorrect .aux file information, especially if this facilitates speed. But I would add reason 2A) for using \include: To produce a partial document that is identical to part of the whole document. I think there are a lot of applications where this is a common need. Of course you can always produce the entire thing and whittle it down, e.g. with "dvips -pp 20-33" but that is an extra-LaTeX solution.