A popular objection to planning I keep hearing, especially in the startup world, is “but we don’t have enough data”. Indeed, not having enough data is the reason why you should be planning: to find out step-by-step if the reality matches your anticipation, and where exactly it deviates from it. Planning is the art of avoiding negative surprises, and you should practice it early on. — As I pointed out in my last entry, the first time you’re tasked with providing evidence that your business idea is not a bunch of hooey, you likely got nothing. So I asked you to make something up, and mark it with a tag “not entirely random but probably not…