A way to take ACTion to change a process quickly without needing to check if its in control or out of control. A way to ACT upon profound knowledge about a process or system to improve it or reduce waste. A way to DO something to correct an out of control process? A way to ensure a stable method is followed to limit defects coming out of any business process. A way to humanely control the Shrew market segment. A way to find out WHO is to blame for a process that is out of control. A way to PLAN for a process intervention. A way CHECK up on the result of something done to correct an out of control process. A way to ensure an ISO [look it up] renewal every year for marketing to show off