"I have even more in-line notes nowadays. Almost all my low-level analysis, backgrounding, and plotting is done as commentary within the manuscript. I use RCS, a free revision control system, to back up my manuscript after each writing session, so it is easy to see the changes and revisions that happen day by day. The RCS file could be used as the basis for all sorts of interesting graphics. For instance, there could be a video of a color-coded matrix (with, say, one kilobyte of story text per matrix cell) where the colors show the age of the last significant change made to each little part of the novel. With such a video you could see the story grow, but as it did there would be flickering little changes in past writing, and systematic sweeps of color change as I made global revisions and checks. When I get some time, I’m going to look into the best way of making the RCS form of the manuscript public."

(From this short interview.)

RIP to one of the greats.