There are several reasons why what gets measured gets managed:
This is the first benefit you get by measuring something. How can you manage something if you don’t even pay attention to it? By measuring something you direct your attention there.
Sometimes we don’t realize the severity of a problem we have until we see the facts. That’s why measuring something is important. It helps you see the truth of where you actually are. In personal finance, for instance, it’s easy to think that you already live wisely. Only after you see your income and expenses by numbers might you realize that you have problem. This realization in turn gives you the motivation to do something about it.
Not only can measuring help you know where you are, it also helps you see your progress. You will see whether or not you have done the right thing and – if you do – whether or not you have done enough. Seeing how far you’ve gone also motivates you to keep moving forward.