The Japanese perfected just-in-time inventory, with a great many savings and benefits. Right when you need a product, you produce it. No need to worry about the cost of holding that inventory and sitting pretty on potentially 5,000 extra units of stuff that might not sell.
Similarly, while I was stressing out over my class schedule last summer, I realized the sheer pointlessness of brooding over decisions that I can’t possibly make without further, next-to-the-last-minute information. I’m not going to be able to decide between two core classes unless I shop both of them…two or three months down the road. There’s no point in spending hours two or three months ahead of time trying to decide between the two.
Just-In-Time thinking is a way of managing decision-making, so that you think through what you need to think through WHEN you need to think through it.