I've written documents for Jeff, and IMO, the six-page narrative memo is a key part of Amazon's success. It's so easy to fool both yourself and your audience with an oral presentation or powerpoint slides. With narrative text that has to stand on its own, there is no place for poor reasoning to hide. Amazon's leadership makes better decisions than their competitors in part because they are routinely supplied with better arguments than their competitors.
"Writing is nature's way of letting you know how sloppy your thinking is." -Dick Guindon, via Leslie Lamport
"Writing is nature's way of letting you know how sloppy your thinking is." -Dick Guindon, via Leslie Lamport