Since I've finished two short stories in the last month I've decided to start on one of my many novel ideas (get it?). Because I've laid the groundwork over many years and already have a dearth of material to draw on, I'm finding that I tend to write chapters haphazardly as the mood strikes rather than forcing myself to stick to a strict regimen of start to finish. So far I've written a chapter almost in the middle of the book, one closer to the start and another about two-thirds through. And the chapters I have lined up ready to go in my head are in no particular order either. So I was wondering how others go about the process? Do you attempt to write from start to finish? Do you write in some sort of logical order, like a beginning, middle and end before finishing all the bits off in-between? Or do you just write whatever, whenever, and figure that you'll stick it all together like a jigsaw puzzle later on?