I was revising away yesterday, and some of what I have to do is what I call "filling in the blanks," the parts where I've gone through the previous draft and moved or changed things and then write detailed notes, such as:
"Show B. getting more upset"
"Get them to other location."
In other words, ACK! I need to write original material to fill the blanks between new material and old, and sadly, based on the sketchiest of outlines.
Sometimes there's more. Indeed, sometimes I've written out the new material and attached it to the page. Thank goodness. Because this is one darned fine way to drive my own self nuts!