Everyone, congratulations, you have successfully completed this section, history of statistical process control and introduction to variation. In this section you learned what is the history of statistical process control, and why is variation an enemy to your business process. In a nutshell, you now know that special cause variation is definitely an enemy to the business process and eventually leads the process to be out of control. You may not be able to eliminate the special causes fully, but there is a way to detect them how you are about to learn more about this in the next section. Thank you for attending. See you in the next one.