When I started the book, I hadn’t planned on it being only dialogue. I knew it would be primarily a series of interviews, or interrogations, but I figured there would be some interstitial text of some kind. But then as I went along, I found ways to give direction and background, and even indications of the time of day and weather, without ever leaving the dialogue itself. So it became a kind of challenge and operating constraint that shaped the way I wrote the book. Constraints are often really helpful in keeping a piece of writing taut.
See here for the rest of this McSweeney’s interview with Dave Eggers about his newest novel, Your Fathers, Where Are They? And the Prophets, Do They Live Forever?