Jerry [Porras] and I found one big giant background genius of the AND called “preserve the core and stimulate progress.” When you look over time, this is what makes for an enduring enterprise. Think of it as a yin and yang symbol. On one side of that yin/yang is a core; preserve the core. It’s about holding to the core, about remaining consistent and true to something. But on the other side is stimulate progress: change, improvement, innovation, going forward, being on the balls of your feet. What we found is this marvelous ability to, on the one hand, preserve the core and, on the other hand, stimulate progress at the same time, all the time. This is the big picture of why some endure as great while others do not.