When it comes to assessing an IT transformation (such as Agile and DevOps), performance metrics have come under intense scrutiny. Traditional performance metrics, such as counting the number of lines of code and the number of software bugs should be used with caution, because there are bugs that are not worth fixing and code that is not worth maintaining. These old-school performance metrics represent activities, not outcomes. To visualize and optimize the business value of your software delivery, you need to find a way to measure business outcomes. To do that, we need flow metrics.