The key to managing complexity is to focus on the interfaces between components, not their implementations.

译文：醉酒后挑亮油灯端详宝剑，梦中又回到了号角声震天的军营。把烤牛肉分给部下享用，让乐器奏起悲壮的边塞战歌，秋高气爽的战场上正检阅军队。

商业中最危险的一句话是"我们一直都是这样做的"。