The technique is marvelously described in the classic management text The One Minute Manager. - Ben Horowitz

Spend zero time on what you could have done, and devote all of your time on what you might do. Because in the end, nobody cares; just run your company.

In order to build a great technology company, you have to hire lots of incredibly smart people. It’s a total waste to have lots of big brains but not let them work on your biggest problems. A brain, no matter how big, cannot solve a problem it doesn’t know about.

FOCUSING TOO MUCH ON THE NUMBERS In the second example, I managed the team to a set of numbers that did not fully capture what I wanted. I wanted a great product that customers would love with high quality and on time — in that order. Unfortunately, the metrics that I set did not capture those priorities. At a basic level, metrics are incentives. By measuring quality, features, and schedule and discussing them at every staff meeting, my people focused intensely on those metrics to the exclusion of other goals. The metrics did not describe the real goals and I distracted the team as a result. Interestingly, I see this same problem play out in many consumer Internet startups. I often see teams that maniacally focus on their metrics around customer acquisition and retention. This usually works well for customer acquisition, but not so well for retention. Why? For many products, metrics often describe the customer acquisition goal in enough detail to provide sufficient management guidance. In contrast, the metrics for customer retention do not provide enough color to be a complete management tool. As a result, many young companies overemphasize retention metrics and do not spend enough time going deep enough on the actual user experience. This generally results in a frantic numbers chase that does not end in a great product. It’s important to supplement a great product vision with a strong discipline around the metrics, but if you substitute metrics for product vision, you will not get what you want.